Let your conversation be without covetousness; and be content with such things as ye have: for He hath said, I will never leave thee, nor forsake thee. – Hebrews 13:5

It seems from our text that “He hath said” is not only useful to chase away doubts, fears, difficulties, and devils, but that it also yieldeth nourishment to all our graces. You perceive that when the apostle would make us contented, he says, “Be content with such things as ye have, for He hath said;” and when he would make us bold and courageous, he puts it, “He hath said, therefore, we may boldly say, God is my helper, I will not fear what man can do unto me.” When the apostle would nourish faith, he does it by quoting from Scripture the examples of Abraham, of Isaac, of Jacob, of Moses, of Gideon, of Barak, and of Jephthah. When he would nourish our patience, he says, “Ye remember the patience of Job;” or if it be our prayerfulness, he says, “Elias was a man of like passions with us, and he prayed and prevailed.” “He hath said” is food for every grace as well as death for every sin. Here you have nourishment for that which is good, and poison for that which is evil. Search ye, then, the Scriptures, for so shall ye grow healthy, strong, and vigorous in the divine life.

“The soul that on Jesus hath lean’d for repose,
I will not, I will not desert to his foes;
That soul, though all hell should endeavor to shake,
I’ll never, no never, no never forsake.”

~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0477.cfm

O taste and see that the LORD is good: blessed is the man that trusteth in Him. – Psalm 34:8

We can recollect the sayings of great men; we treasure up the verses of renowned poets; ought we not to be profound in our knowledge of the words of God? The Scriptures should be the classics of a Christian, and as our orators quote Homer, or Virgil, or Horace, when they would clinch a point, so we should be able to quote the promises of God when we would solve a difficulty or overthrow a doubt. “He hath said,” is the foundation of all riches and the fountain of all comfort, let it dwell in you richly as “a well of water, springing up unto everlasting life.” And, oh, my brethren, how diligently should we test the Scriptures! Besides searching them by reading, and treasuring them by memory, we should test them by experience, and so often as a promise is proven to be true we should make a mark against it, and note that we also can say, as did one of old, “This is my comfort in my affliction: for Thy word hath quickened me.” “Wait on the Lord,” said Isaiah, and then he added “Wait, I say, on the Lord,” as if his own experience led him to echo the voice of God to his hearers. Test the promise, take God’s banknote to the counter, and mark if it be cashed. Grasp the lever, which He ordains to lift your trials, and try if it possesses real power. Cast this divine tree into the bitter waters of your Marah, and learn how it will sweeten them. Take this salt, and throw it into the turbid waters, and witness if they be not made sweet, as were the waters of old by the prophet Elisha. Taste and see that the Lord is good, for there is no want to them that fear Him.

“He hath said;” let us do the same, for, though the words of ministers may be sweet, the words of God are sweeter; and though original thoughts may have the novelty of freshness, yet the ancient words of God have the ring, and the weight, and the value of old and precious coins, and they shall not be found wanting in the day when we shall use them. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0477.cfm

“He hath said…”- Hebrews 13:5

What power resides in “Thus saith the Lord!” The man who can grasp by faith, “He hath said,” has an all-conquering weapon in his hand. What doubt will not be slain by this two-edged sword? What fear is that which shall not fall smitten with a deadly wound before this arrow from the bow of God’s covenant? Will not the distresses of life and the pangs of death, will not the corruptions within and the temptations without, will not the trials from above and the temptations from beneath all seem but light afflictions when we can hide ourselves behind the bulwark of “He hath said?” Whether for delight in our quietude, or for strength in our conflict, “He hath said” must be our daily resort.

Hence, let us learn, my brethren, the extreme value of searching the Scriptures. There may be a promise in the Word which would exactly fit your case, but you may not know of it, and therefore miss its comfort. You are like prisoners in a dungeon, and there may be one key in the bunch which would unlock the door, and you might be free; but if you will not look for it you may remain a prisoner still, though liberty is near at hand. There may be a potent medicine in the great pharmacopia of Scripture, and you may still remain sick, though there is the precise remedy that would meet your disease, unless you will examine and search the Scriptures to discover what “He hath said.” Should we not, beside reading Scripture, store our memories richly with the promises of God?  ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0477.cfm