'Desertion' in the Bible

Then the commanders of [the] Philistines said, "What [are] these Hebrews [doing here]?" And Achish said to the commanders of [the] Philistines, "Is this not David, the servant of Saul, the king of Israel, who has been with me {for days and years}? I have not found anything [threatening] in him from the day of his desertion until this day!"

And I said, “This is my grief,That the right hand of the Most High has changed [and His lovingkindness is withheld].”

“Your own wickedness will discipline you,And your desertion of the faith will punish you.Know therefore that it is an evil and bitter thingFor you to abandon (reject) the Lord your God,And for you to be indifferent to Me and dismiss the [reverent] fear of Me,” says the Lord God of hosts.

Therefore a lion from the forest will kill them,A wolf of the deserts will destroy them,A leopard is watching their cities.Everyone who goes out of them shall be torn in pieces,Because their transgressions are many,Their desertions of faith are countless.

All her idols shall be broken in pieces,All her earnings [from her idolatry] shall be burned with fire,And all her images I shall make desolate;For from the earnings of a prostitute she collected them,And to the earnings of a prostitute they shall return.