Deuteronomy 15:10

15:10 You must by all means lend ¹  to him and not be upset by doing it, ²  for because of this the Lord your God will bless you in all your work and in everything you attempt.

Deuteronomy 25:5

Respect for the Sanctity of Others

25:5 If brothers live together and one of them dies without having a son, the dead man’s wife must not remarry someone outside the family. Instead, her late husband’s brother must go to her, marry her, ³  and perform the duty of a brother-in-law. ⁴ 

[15:10]  ¹ tn The Hebrew text uses the infinitive absolute for emphasis, which the translation indicates with “by all means.”

[15:10]  ² tc Heb “your heart must not be grieved in giving to him.” The LXX and Orig add, “you shall surely lend to him sufficient for his need,” a suggestion based on the same basic idea in v. 8. Such slavish adherence to stock phrases is without warrant in most cases, and certainly here.

[25:5]  ³ tn Heb “take her as wife”; NRSV “taking her in marriage.”

[25:5]  ⁴ sn This is the so-called “levirate” custom (from the Latin term levir, “brother-in-law”), an ancient provision whereby a man who died without male descendants to carry on his name could have a son by proxy, that is, through a surviving brother who would marry his widow and whose first son would then be attributed to the brother who had died. This is the only reference to this practice in an OT legal text but it is illustrated in the story of Judah and his sons (Gen 38) and possibly in the account of Ruth and Boaz (Ruth 2:8; 3:12; 4:6).