John 2:22

22So after he was raised from the dead, his disciples remembered that he had said this, and they believed the scripture
They believed the scripture is probably an anaphoric reference to Ps 69:9 (69:10 LXX), quoted in John 2:17 above. Presumably the disciples did not remember Ps 69:9 on the spot, but it was a later insight.
and the saying
Or “statement”; Grk “word.”
that Jesus had spoken.

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