John Wesley on Ruth 4:7

All things - That is, in all alienation of lands. So that it is no wonder if this ceremony differ a little from that, Deut 25:9, because that concerned only one case, but this is more general. Besides, he pleads not the command of God, but only ancient custom, for this practice. Gave it - He who relinquished his right to another, plucked off his own shoe and gave it to him. This was symbolical, and a significant and convenient ceremony, as if he said, take this shoe wherewith I used to go and tread upon my land, and in that shoe do thou enter upon it, and take possession of it. This was a testimony - This was admitted for sufficient evidence in all such cases.