That he should offer himself often (ina pollaki prosperh eauton). Purpose clause with ina and present active subjunctive of prosperw (keep on offering himself, like 1 John 5:11 John 5:3 ). With blood not his own (en aimati allotriwi). So-called instrumental use of en (accompaniment). allotrio means "belonging to another," "not one's own" ( Luke 16:12 ).