An ass or an ox - See on Luke 13:15 (note).

Which.

Luke 13:15 The Lord then answered him, and said, You hypocrite, does not each one of you on the sabbath loose his ox or his donkey from the stall...

Exodus 23:4,5 If you meet your enemy's ox or his donkey going astray, you shall surely bring it back to him again...

Daniel 4:24 This is the interpretation, O king, and this is the decree of the most High, which is come on my lord the king:

Matthew 12:11,12 And he said to them, What man shall there be among you, that shall have one sheep, and if it fall into a pit on the sabbath day...

The Lessons of a Feast
'And it came to pass, as He went into the house of one of the chief Pharisees to eat bread on the Sabbath day, that they watched Him. 2. And, behold, there was a certain man before Him which had the dropsy. 3. And Jesus answering spake unto the lawyers and Pharisees, saying, Is it lawful to heal on the Sabbath day? 4. And they held their peace. And He took him, and healed him, and let him go; 5. And answered them, saying, Which of you shall have an ass or an ox fallen into a pit, and will not straightway …
Alexander Maclaren—Expositions Of Holy Scripture

Cost of Discipleship must be Counted.
(Probably Peræa.) ^C Luke XIV. 25-35. ^c 25 Now there went with him great multitudes [he had hitherto spent but little time in Peræa, and the people were availing themselves of this opportunity to see and hear him]: and he turned, and said unto them, 26 If any man cometh unto me, and hateth not his own father, and mother, and wife, and children, and brethren, and sisters, yea, and his own life also, he cannot be my disciple. ["Hateth," as used here, is an example of phenomenal speech, …
J. W. McGarvey—The Four-Fold Gospel

Increasing Progression of Enthusiasm and of Exaltation.
It is clear that such a religious society, founded solely on the expectation of the kingdom of God, must be in itself very incomplete. The first Christian generation lived almost entirely upon expectations and dreams. On the eve of seeing the world come to an end, they regarded as useless everything which only served to prolong it. Possession of property was interdicted.[1] Everything which attaches man to earth, everything which draws him aside from heaven, was to be avoided. Although several of …
Ernest Renan—The Life of Jesus