This chapter is based on Acts 2:1.
When Jesus opened the understanding of the disciples to the meaning of the prophecies concerning Himself, He assured them that all power was given Him in heaven and on earth, and bade them go preach the gospel to every creature. The disciples, with a sudden revival of their old hope that Jesus would take His place upon the throne of David at Jerusalem, inquired, “Wilt Thou at this time restore again the kingdom to Israel?” Acts 1:6. The Saviour threw an uncertainty over their minds in regard to the subject by replying that it was not for them “to know the times or the seasons, which the Father hath put in His own power.” Acts 1:7. SR 241.1
The disciples began to hope that the wonderful descent of the Holy Ghost would influence the Jewish people to accept Jesus. The Saviour forbore to further explain, for He knew that when the Holy Spirit should come upon them in full measure their minds would be illuminated and they would fully understand the work before them, and take it up just where He had left it. SR 241.2
The disciples assembled in the upper chamber, uniting in supplications with the believing women, with Mary the mother of Jesus, and with His brethren. These brethren, who had been unbelieving, were now fully established in their faith by the scenes attending the crucifixion and by the resurrection and ascension of the Lord. The number assembled was about one hundred and twenty. SR 241.3