וַיֹּ֕אמֶר וּמֶ֖ה לַעֲשׂ֣וֹת לָ֑הּ וַיֹּ֣אמֶר גֵּיחֲזִ֗י אֲבָ֛ל בֵּ֥ן אֵֽין־לָ֖הּ וְאִישָׁ֥הּ זָקֵֽן׃
Egli disse: «Che cosa dunque si può fare per lei?». E Ghehazi rispose: «In verità, ella non ha figli, e suo marito è vecchio».
From David to Destruction
2. "And her husband is old" (Melachim II 4:14); "and my husband is old" (BeReishit 18:12).
Rashi
אבל VERILY — This word implies confirmation of a statement, just as (Genesis 42:21) “Verily (אבל) we are guilty”, and (2 Kings 4:14) “Verily (אבל) she has no son”.
Ramban
‘AVAL’ SARAH THY WIFE. This is like the verse, “Aval” she has no son,457II Kings 4:14. the word aval meaning “only.” He thus said: “Only the son of whom I informed you, your wife Sarah will give birth to, and with him will I establish My covenant forever and with his seed after him; and Ishmael I will bless by making his children numerous, but this will not be because of My covenant with him.”