Take thou no usury of him - Usury, at present, signifies unlawful interest for money. Properly, it means the reward or compensation given for the use of a thing, but is principally spoken of money. For the definition of the original term, See the note on Exodus 22:25.

Exodus 21:2,3 If you buy an Hebrew servant, six years he shall serve: and in the seventh he shall go out free for nothing...

Boniface viii Ad 1294-1303.
PART I In Celestine's place was chosen Benedict Gaetani, who, although even older than the worn-out and doting late pope, was still full of strength, both in body and in mind. Benedict (who took the name of Boniface VIII) is said to have been very learned, especially in matters at law; but his pride and ambition led him into attempts which ended in his own ruin, and did serious harm to the papacy. In the year 1300 Boniface set on foot what was called the Jubilee. You will remember the Jubilee which …
J. C. Roberston—Sketches of Church History, from AD 33 to the Reformation

Baptism
Go ye, therefore, and teach all nations, baptising them in the name of the Father, and of the Son, and of the Holy Ghost; teaching them,' &c. Matt 28: 19. I. The way whereby Christ communicates to us the benefits of redemptions, is, in the use of the sacraments. What are the sacraments in general? They are visible signs of invisible grace. Is not the word of God sufficient to salvation? What need then is there of sacraments? We must not be wise above what is written. It is God's will that his church …
Thomas Watson—The Ten Commandments

Leviticus
The emphasis which modern criticism has very properly laid on the prophetic books and the prophetic element generally in the Old Testament, has had the effect of somewhat diverting popular attention from the priestly contributions to the literature and religion of Israel. From this neglect Leviticus has suffered most. Yet for many reasons it is worthy of close attention; it is the deliberate expression of the priestly mind of Israel at its best, and it thus forms a welcome foil to the unattractive …
John Edgar McFadyen—Introduction to the Old Testament