For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.
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John Chrysostom
AD 407
Well, who then is He that swore unto Abraham? Is it not the Son? No, one says. Certainly indeed it was He: however, I shall not dispute [thereon]. So when He [the Son] swears the same oath, Verily, verily, I say unto you, is it not plain that it was because He could not swear by any greater? For as the Father swore, so also the Son swears by Himself, saying, Verily, verily, I say unto you. He here reminds them also of the oaths of Christ, which He was constantly uttering. Verily, verily, I say unto you, he that believes in Me shall never die. John 11:26
What is, And an oath for confirmation is to them an end of all strife? It is instead of, by this every doubtful question is solved: not this, or this, but every one.