Where does “selamat pagi” come from?

selamat pagi (Indonesian) comes from Malay selamat pagi, from Malay selamat, from Arabic سَلَامَة — good health.

selamat pagi (Indonesian): good morning

Definitions

Step	Language	Word	Meaning
1	Malay	selamat pagi	good morning
2	Malay	selamat	safety, security, peace; safe, secure;...
3	Arabic	سَلَامَة	good health

selamat pagi — Etymology, Origin & Word History | Etymology Explorer