Where does “ма́терная брань” come from?

ма́терная брань (Russian) comes from Russian мать, from Old East Slavic мати, from Proto-Slavic mati, from Proto-Balto-Slavic mā́ˀtē, from Proto-Indo-European méh₂tēr — mother.

Ancestry of “ма́терная брань”, step by step

Step	Language	Word	Meaning
1	Russian	мать	mother
2	Old East Slavic	мати	mother
3	Proto-Slavic	mati	mother
4	Proto-Balto-Slavic	mā́ˀtē	mother
5	Proto-Indo-European	méh₂tēr	mother

Every word from Proto-Indo-European méh₂tēr →Every word from Proto-Balto-Slavic mā́ˀtē →Every word from Proto-Slavic mati →