Where the pattern begins
The earliest movement is not a full doctrine of resurrection but a pattern of life given where death seemed certain. Genesis 22 is especially important: Isaac is placed under the sentence of death and received back, while God provides the substitute. Hebrews later reads this as Abraham receiving Isaac back in a figurative sense. That pattern does not carry the whole doctrine, but it begins to train the reader to see that God's promise can pass through death and still stand.