Albert Barnes Commentary Psalms 106:29

"Thus they provoked him to anger with their doings; And the plague brake in upon them." — Psalms 106:29 (ASV)

Thus they provoked him to anger with their inventions – The word rendered “inventions” means properly “works; deeds;” then it is used in the sense of “evil” deeds, crimes.

And the plague brake in upon them – See Numbers 25:8-9. No less than twenty-four thousand fell in the plague (Numbers 25:9).