Tempted; desired a trial and proof of God's power, as the next verse plainly showeth. See Numbers 11:4. For their lust; not for their necessary subsistence, for which they had manna, but out of an inordinate and luxurious appetite.
Related Commentaries of Psalms 78:18
Psalms 78:18
18 And they tempted God in their heart by asking meat for their lust.