Acts 1:8 (ESV)
8 But you will receive power when the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem and in all Judea and Samaria, and to the end of the earth.
2 Timothy 4:1-8 (ESV)
I charge you in the presence of God and of Christ Jesus, who is to judge the living and the dead, and by his appearing and his kingdom:2 preach the word; be ready in season and out of season; reprove, rebuke, and exhort, with complete patience and teaching. 3 For the time is coming when people will not endure sound[a] teaching, but having itching ears they will accumulate for themselves teachers to suit their own passions, 4 and will turn away from listening to the truth and wander off into myths. 5 As for you, always be sober-minded, endure suffering, do the work of an evangelist, fulfill your ministry.
6 For I am already being poured out as a drink offering, and the time of my departure has come. 7 I have fought the good fight, I have finished the race, I have kept the faith. 8 Henceforth there is laid up for me the crown of righteousness, which the Lord, the righteous judge, will award to me on that day, and not only to me but also to all who have loved his appearing.