Where does “bēd-” come from?

bēd- (Proto-Balto-Slavic) comes from Proto-Indo-European bʰedʰh₂- — to dig, burrow; to pierce, stab.

Ancestry of “bēd-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	bʰedʰh₂-	to dig, burrow; to pierce, stab

bēd- — Etymology, Origin & Word History | Etymology Explorer