Now we come to Gal 4:21ff. Paul speaks of two mothers, Hagar and Sarah, whose children, Ishmael and Isaac respectively, symbolize the Old and New Covenants.
Isaac is not Christ, but he is a 'type' of Him. He was long promised, he had a miraculous birth, he was persecuted by his own people, he was, in a figure, sacrificed by his father, and figuratively raised from the dead (Heb 11:17-19 ). All the promises were tied up in him.
Ishmael is not the Israelites, but he is a type of them. He had only temporal blessings (Gen 17:20 ); he was brought up in a godly household, but it did him no good; he persecuted the true heir; he was finally cast out of the inheritance (Gen 21:10 ).
Therefore Ishmael's mother is said by Paul to symolize the Old (Mosaic) Covenant. It promised only temporal benefits (long life in the land of Canaan) and was dependent upon good behaviour (Exod 19:5 etc) which was not forthcoming and resulted in forfeiture (2Chron 36:14ff etc). But Isaac's mother symolizes the New Covenant in Christ's blood of which it is written,
'I give them eternal life, and they shall never perish; neither shall anyone snatch them out of My hand.'
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