What happens if foreign incense is brought on the inner altar: Zevachim 27b
What happens if foreign incense is brought on the outer altar: Zevachim 27b
Is pigul intent while bringing ketoret significant, given that the ketoret is not rendered permissible for use by service involving some other [matir] item; its own service permits its own use: Zevachim 42b-43b, 44a
