Exodus 21:9

Second special case: if at the time of purchasing the woman, her master intends her for his son.

If he designate her for his son, he shall deal with her according to the rights of daughters i.e. treat her as a daughter of his own household, give her the maintenance, clothing, &c. which a daughter would naturally have.

for his son -as in Persia (Chardin, Voyage, ii. 259), Arabia, Niebuhr, Arabia, p. 74, Snouck-Hurgronje, Mekka, p. 157" (Dillm.-Ryss.).