Charles H. Spurgeon on Psalms 106:25

But murmured in their tents. From unbelief to murmuring is a short and natural step; they even fell to weeping when they had the best ground for rejoicing. Murmuring is a great sin and not a mere weakness; it contains within itself unbelief, pride, rebellion, and a whole host of sins. It is a home sin, and is generally practised by complainers "in their tents, "but it is just as evil there as in the streets, and will be quite as grievous to the Lord. And hearkened not unto the voice of the Lord. Making a din with their own voices, they refused attention to their best Friend. Murmurers are bad hearers.