Amos 5:25

Have ye offered unto me sacrifices and offerings
No; they were not offered to God, but to devils, to the golden calf, and to the host of heaven: so their fathers did in the wilderness forty years;
where sacrifices were omitted during that time, a round number for a broken one, it being about thirty eight years; and these their children were imitators of them, and offered sacrifice to idols too, and therefore deserved punishment as they: even ye, O house of Israel?
the ten tribes, who are here particularly charged and threatened; (See Gill on Acts 7:42).