Genesis 18:18

18 But Abraam shall become a great and populous nation, and in him shall all the nations of the earth be blest.

Genesis 18:18 Meaning and Commentary

Genesis 18:18

Seeing that Abraham shall surely become a great and mighty
nation
Which was fulfilled in the nation of Israel, so called, not so much for the largeness of the place they dwelt in, and the number of its inhabitants, as for the law of God that was given them, and the worship of God kept up among them; on account of which there was no nation so great, ( Deuteronomy 4:8 ) ; and all the nations of the earth shall be blessed in him;
in his seed, the Messiah, in whom some of all nations are blessed with all spiritual blessings. Now, since God had promised, and would do such great things for him and his, he judged it right and proper not to hide from him what he was about to do at Sodom, and the rather, as he had a near relation that dwelt there.

Genesis 18:18 In-Context

16 And the men having risen up from thence looked towards Sodom and Gomorrha. And Abraam went with them, attending them on their journey.
17 And the Lord said, Shall I hide from Abraam my servant what things I intend to do?
18 But Abraam shall become a great and populous nation, and in him shall all the nations of the earth be blest.
19 For I know that he will order his sons, and his house after him, and they will keep the ways of the Lord, to do justice and judgment, that the Lord may bring upon Abraam all things whatsoever he has spoken to him.
20 And the Lord said, The cry of Sodom and Gomorrha has been increased towards me, and their sins are very great.

The Brenton translation of the Septuagint is in the public domain.