John Gill Commentary Hebrews 11:12

"wherefore also there sprang of one, and him as good as dead, [so many] as the stars of heaven in multitude, and as the sand, which is by the sea-shore, innumerable." — Hebrews 11:12 (ASV)

Ver. 12 Therefore sprang there even of one
That is, Abraham: the Arabic version has here a strange interpolation; ``this faith Isaac and Rebecca conceived in mind, and so there were born of one, Esau and Jacob.'' And him as good as dead ;
being an hundred years of age; (See Gill on Romans 4:19). The Ethiopic version reads, "the bodies of both were like a dead carcass"; both of Abraham and Sarah:

so many as the stars of the sky in multitude, and as the sand which
is by the sea shore innumerable ;
as was promised to Abraham, (Genesis 15:5) (22:17) which has been fulfilled, (Isaiah 10:22) and will still have a further fulfilment, (Hosea 1:10) .