Acts 1:3-4 NIV

3 After his suffering, he showed himself to these men and gave many convincing proofs that he was alive. He appeared to them1 over a period of forty days and spoke about the kingdom of God.2

References for Acts 1:3

4 On one occasion, while he was eating with them, he gave them this command: "Do not leave Jerusalem, but wait3 for the gift my Father promised, which you have heard me speak about.4

References for Acts 1:4