Our fathers understood not Thy wonders in Egypt; they remembered not the multitude of Thy mercies; but provoked Him at the sea, even at the Red Sea. – Psalm 106:7

Why does the Psalmist dwell upon the place, and say, “at the sea, even at the Red Sea”? Why was it worse to provoke the Lord there than elsewhere? It evidently was so, for the inspired Scripture mentions the spot twice to put an emphasis upon it. Why was this?

The offense itself was grievous anywhere. They doubted God when they heard that Pharaoh pursued after them, and they said, “Because there were no graves in Egypt, hast Thou taken us away to die in the wilderness?” This imputation of cruelty to their faithful God provoked His sacred heart. The Lord is very pitiful, and His name is love, and therefore He is not easily provoked; but He declares that He was provoked by this display of their mistrust. They provoked Him: they called Him forth, as it were, to battle; they vexed Him and stirred Him up to contend with them. O brothers and sisters, after so much love as God has shown us, we must not fall to provoking Him; let us far rather spend our lives in extolling Him! To provoke Him at any time is a wanton wickedness—unjust, ungenerous, diabolical. It is no common sin which thus provokes the longsuffering Lord. Many a sin God has endured patiently, but in this case, He is provoked to anger. This is an offense which touches the apple of His eye and causes His jealousy to burn like coals of fire. O children of God, how can you provoke your Father to wrath? The Lord have mercy upon us! We must bow low at His feet with sorrowful repentance. Let us shun this fault in the future. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2204.cfm