Pulpit Commentary :"The paradox was self-interpreting. Let the spiritually dead have to do with death; dead men belong in a special sense to them. Observe that there was no danger of his father remaining unburied. Christ means that there are times when his service admits of no postponement, however sacred the conflicting duty. His followers must on such occasions be very Nazarites (Numbers 6:7) or high priests (Leviticus 21:11)."