John Lightfoot on Matthew 3:11

[Whose shoes I am not worthy to bear.] In Luke it is to unloose the latchet of his shoes: which comes to the same thing: both sound to the same import, as if he had said, 'Whose servant I am not worthy to be.'

"A Canaanite servant is like a farm, in respect of buying: for he is bought with money, or with a writing, or by some service done as a pledge or pawn. And what is such a pawning in the buying of servants? Namely, that he looseth the shoe of him [who buys], or binds on his shoe, or carries to the bath such things as be necessary for him," &c. These things Maimonides produceth out of the Talmud, where these words are, "How is a servant bought by service? He looseneth the buyer's shoe; he carrieth such things after him as are necessary for the bath; he unclothes him; washes, anoints, rubs, dresses him; puts on his shoes, and lifts him up from the earth," &c. See also the Tosaphta.

This, by the way, is to be noted, which the Gloss intimates, that all servants, of what heathen nation soever, bought by the Jews, were called 'Canaanite servants,' because it is said of Canaan, "Canaan a servant of servants."