Yea, they spake against God; they said, Can God furnish a table in the wilderness?(Psalm 78:19)

Behold, he smote the rock, that the waters gushed out, and the streams overflowed; can he give bread also? can he provide flesh for his people?(Psalm 78:20)

Therefore the LORD heard this, and was wroth: so a fire was kindled against Jacob, and anger also came up against Israel;(Psalm 78:21)

Because they believed not in God, and trusted not in his salvation:

Though he had commanded the clouds from above, and opened the doors of heaven,(Psalm 78:23)

And had rained down manna upon them to eat, and had given them of the corn of heaven.(Psalm 78:24)

Man did eat angels' food: he sent them meat to the full.(Psalm 78:25)

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Psalm 78:22 - Cross Reference

And to whom sware he that they should not enter into his rest, but to them that believed not? (Hebrews 3:18)

I will therefore put you in remembrance, though ye once knew this, how that the Lord, having saved the people out of the land of Egypt, afterward destroyed them that believed not. (Jude 1:5)

But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him. (Hebrews 11:6)

He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son. (1 John 5:10)

Yea, they despised the pleasant land, they believed not his word: (Psalm 106:24)

And the head of Ephraim is Samaria, and the head of Samaria is Remaliah's son. If ye will not believe, surely ye shall not be established. (Isaiah 7:9)

Yet in this thing ye did not believe the LORD your God, (Deuteronomy 1:32)

Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God. (Hebrews 3:12)