Reference for Psalms 106:29

וַ֭יַּכְעִיסוּ בְּמַֽעַלְלֵיהֶ֑ם וַתִּפְרָץ־בָּ֝֗ם מַגֵּפָֽה׃

Thus they provoked Him with their doings, And the plague broke in upon them.

ספר השרשים