Mark 10:2

Is it lawful for a man to put away his wife "for every cause?" as St Matthew adds (Matthew 19:3). On this point the rival schools of Hillel and Shammai were divided, the former adopting the more lax, the latter the stricter view: the one holding that any dislike, which he felt towards her, would justify a man in putting away his wife; the other, that only notorious unchastity could be a sufficient reason. It has also been suggested that the object of the question may have been to involve Him with the adulterous tetrarch, in whose territory He was.