SEV Biblia, Chapter 21:10
Por tanto dijo a Abraham: Echa a esta sierva y a su hijo; que el hijo de esta sierva no ha de heredar con mi hijo, con Isaac.
Clarke's Bible Commentary - Genesis 21:10
Verse 10. Cast out this bondwoman and her son] Both Sarah and Abraham have been accused of cruelty in this transaction, because every word reads harsh to us. Cast out; ¨rg garash signifies not only to thrust out, drive away, and expel, but also to divorce; (see Lev. xxi. 7;) and it is in this latter sense the word should be understood here. The child of Abraham by Hagar might be considered as having a right at least to a part of the inheritance; and as it was sufficiently known to Sarah that God had designed that the succession should be established in the line of Isaac, she wished Abraham to divorce Hagar, or to perform some sort of legal act by which Ishmael might be excluded from all claim on the inheritance.
Matthew Henry Commentary
Verses 9-13 - Let us not overlook the manner in which this family matter instructs u not to rest in outward privileges, or in our own doings. And let u seek the blessings of the new covenant by faith in its Divine Surety Ishmael's conduct was persecution, being done in profane contempt of the covenant and promise, and with malice against Isaac. God take notice of what children say and do in their play; and will reckon with them, if they say or do amiss, though their parents do not. Mocking in a great sin, and very provoking to God. And the children of promis must expect to be mocked. Abraham was grieved that Ishmael shoul misbehave, and Sarah demand so severe a punishment. But God showed his that Isaac must be the father of the promised Seed; therefore, sen Ishmael away, lest he corrupt the manners, or try to take the rights of Isaac. The covenant seed of Abraham must be a people by themselves, no mingled with those who were out of covenant: Sarah little thought of this; but God turned aright what she said.
Original Hebrew
ותאמר 559 לאברהם 85 גרשׁ 1644 האמה 519 הזאת 2063 ואת 853 בנה 1121 כי 3588 לא 3808 יירשׁ 3423 בן 1121 האמה 519 הזאת 2063 עם 5973 בני 1121 עם 5973 יצחק׃ 3327