“17 By faith Abraham, when he was put to the test [while the testing of his faith ...

... was still in progress],had already brought Isaac for an offering; he who had gladly received and welcomed [God’s] promises was ready to sacrifice his only son,
18 Of whom it was said, Through Isaac shall your descendants be reckoned.
19 For he reasoned that God was able to raise [him] up even from among the dead. Indeed in the sense that Isaac was figuratively dead [potentially sacrificed], he did [actually] receive him back from the dead,” Hebrews 11:17-19 AMPC. Public domain image: Rembrandt, ‘Abraham & Isaac’