72 Heb “he”; the referent (Abraham) has been specified in the translation for clarity.
73 The construction is a verbal hendiadys—the preterite (“he added”) is combined with an adverb “yet” and an infinitive “to speak.”

In other versions

Again he spoke to him and said, “Suppose forty are found there.” He answered, “For the sake of forty I will not do it.”

Once again he spoke to him, “What if only forty are found there?”

He said, “For the sake of forty, I will not do it.”

Then he spoke to him again, “Suppose forty are found there?”

He answered, “I will not do it on account of forty.”

Then Abraham pressed his request further. “Suppose there are only forty?”

And the Lord replied, “I will not destroy it for the sake of the forty.”

And once again he spoke to him and said, “What if forty are found there?” And he answered, “I will not do it on account of the forty.”

And he spake unto him yet again, and said, Peradventure there shall be forty found there. And he said, I will not do it for forty’s sake.

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