Is not the LORD your God with you? – 1 Chronicles 22:18

For this God is our God for ever and ever: He will be our guide even unto death. – Psalm 48:14

Brethren and sisters in Christ, the Lord our God is with us. I do not entertain any doubt upon that point, and I hope you do not. Is the Lord your God? Is He your God by a holy covenant? Have you entered into bonds of fellowship with Him? Have you taken Him to be your God by trust, by love, and by the consecration of your body, soul, and spirit to Him? Can you say of Father, Son and Holy Ghost, “This God is our God for ever and ever: He will be our Guide even unto death”? Very well, then, if He be your God, He is with you. Do you ask how I know that?

Well, I know it because He has pledged Himself to be with His people. “He hath said, I will never leave thee, nor forsake thee.” Is not the Lord your God with you, then? Assuredly He is, if He keeps His promise; and you do not doubt His fidelity, do you? Can He forget His promise, or, remembering it, will He treat it as if it were more verbiage, words without meaning? There are men who can do that, we know; but does God act so? Can you suppose it possible? No, not for an instant; then, as He hath said, “I will never leave thee, nor forsake thee,” He will keep His word. We say, “Never is a long day,” and so it is, for it covers all time; and the Lord hath said, “I will never leave thee,”-in poverty, in sickness, in slander and reproach, in depression of spirit, in the hour of death, in the day of judgment,-“I will never leave thee, nor forsake thee.” He has pledged Himself to this, and God forbid that we should, for even a moment, doubt that He will keep His word! To believers in their church capacity, there is a pledge given by the blessed Lord Jesus Himself which refers especially to His work: “And Jesus came and spake unto them, saying, All power is given unto Me in heaven and in earth. Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.” “Lo, I am with you,” says Christ, as much as to say, “Not only do I promise to be with you, but I am with you, I am already fulfilling My promise to you. For the past, for the present, and for the future, ‘Lo, I am with you alway.'” Let not any Church of God hesitate to answer this question, “Is not the Lord your God with you?” If He be your God, He is with you as individuals, and He is especially with you as a Christian community going forth to preach His gospel to every creature. That ought to be enough, surely? He has pledged Himself to be with us. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2471.cfm