Albert Barnes Commentary Psalms 106:25

"But murmured in their tents, And hearkened not unto the voice of Jehovah." — Psalms 106:25 (ASV)

But murmured in their tents ... (Numbers 14:2, Numbers 14:27). They complained of Moses; they complained of their food; they complained of the hardships of their journey; they complained of God. They did this when in their tents; when they had a comfortable home; when safe; when provided for; when under the direct divine protection and care. So people often complain: perhaps more often when they have many comforts than when they have few.