To leave someone for ever, especially when they need you. (Cambridge Dictionary)
To renounce or turn away from entirely. (Merriam – Webster)
A forsaken place is not lived in, used, or looked after. (Collins Dictionary)
If you forsake someone, you leave them when you should have stayed, or you stop helping them or looking after them. (Collins Dictionary)
Abandoned or deserted. (Oxford Dictionaries)
How to Help Someone Forsake Sin and Turn to Christ.