Where does “preambul” come from?

preambul (Indonesian) comes from Old French preambule, from Medieval Latin praeambulum, from Latin praeambulus, from Latin praeambulo, from Latin ambulō, from Latin ambi-, from Latin ambō, from Proto-Indo-European h₂m̥bʰi — on, onto.

preambul (Indonesian): preamble (short statement or remark, especially an explanatory introduction to a formal document or statute)