Whether a Nazir may fulfill his obligations with offerings dedicated by other people, or with money dedicated by others for their offerings: Temurah 10a; Keritot 27b
Whether an attempt by a Nazirite to substitute another animal in place of an offering which someone donates for his use, is effective in sanctifying that other animal: Temurah 10a
Considering a Nazirite to be mechusar kapparah, and therefore bound by his Nazirite vows, until he brings his completion offerings, and specifically his Chatat offering: Keritot 8b