To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God:
Berean Study Bible (BSB) - Acts 1:3 >After His suffering, He presented Himself to them with many convincing proofs that He was alive. He appeared to them over a span of forty days and spoke about the kingdom of God.
Textus Receptus (TR) - Acts 1:3 >οἷς καὶ παρέστησεν ἑαυτὸν ζῶντα μετὰ τὸ παθεῖν αὐτὸν ἐν πολλοῖς τεκμηρίοις, δι᾿ ἡμερῶν τεσσαράκοντα ὀπτανόμενος αὐτοῖς, καὶ λέγων τὰ περὶ τῆς βασιλείας τοῦ Θεοῦ.