Acts 1:3
New International Version (NIV1984)
3 After his suffering, he showed himself to these men and gave many convincing proofs that he was alive. He appeared to them over a period of forty days and spoke about the kingdom of God.
From BibleGateway.com: http://www.biblegateway.com/passage/?search=Acts 1:3&version=NIV1984
NIV®