Where does “bihasain” come from?

bihasain (Tagalog) comes from Tagalog -in, from Tagalog aghimo, from Tagalog agham, from Sanskrit आगम, from Sanskrit आ-, from Sanskrit आ, from Proto-Indo-Iranian *HáH.

Ancestry of “bihasain”, step by step

Step	Language	Word	Meaning
1	Tagalog	-in	Verb suffix; Adjective-forming suffix: prone to,...
2	Tagalog	aghimo	technique
3	Tagalog	agham	science
4	Sanskrit	आगम	something handed down through tradition; theory,...
5	Sanskrit	आ-	up, upon, on
6	Sanskrit	आ	separated form of आ-; With senses determined by...
7	Proto-Indo-Iranian	*HáH	—

Every word from Proto-Indo-Iranian *HáH →Every word from Sanskrit आ- →Every word from Tagalog -in →