sam 4321
reb moshe was not the only one to write on the subject,
the ramban says chiyuv, the yaavetz says chiyuv, the chazon ish say chiyuv rsz aurbach says acc. to r’ chaim hakohen today it is a chiyuv.
my point was that hakatan quotes things out of context and omits things that don’t support his nk agenda.