Book of Acts, Chapter 1, Verses 15-26 - Ready for Pentecost?
We do not see the Holy Ghost giving these men dictatorial authority. They served the church and the lost. These men did not dominate.
Book of Acts, Chapter 1, Verses 15-16 - Pray On!
In the days after Jesus ascension and here in deciding on someone to take Judas’ place, they instinctively turned to God in prayer 
Book of Acts, Chapter 1, Verses 15-26 - Judas
Somewhere along the way, Satan began to work on Judas, as he had tempted Jesus and desired Peter “that he might sift you as wheat.” (Luke 22:31b). Judas allowed himself to be enticed away. He “fell.”
Book of Acts, Chapter 1, Verses 15-26 - The Church's First Business Meeting
Peter and apparently his peers felt it was important to have twelve ordained workers. This was about staffing the mission.
Book of Acts, Chapter 1, Verses 12-14 - One Accord -- Ten Times in the Book of Acts
It is not enough for Christians to have faith in the Lord; they must also have faith in one another.
Book of Acts, Chapter 1, Verses 12-14 - The First Deed
They continued daily in prayer and supplication. The use of two words which speak of much the same activity adds weight to what those in the upper room were doing.
Book of Acts, Chapter 1, Verses 12-14 - People in the Upper Room
The eleven had received direct instruction. They were to “wait and then go.” In obedience they came to this place to “wait.” Their waiting was not sitting quietly and folding their hands. Instead they took spiritual action. They prayed.
Book of Acts, Chapter 1, Verses 12-14 - Return to Jerusalem
The apostles carried out Jesus’ instructions. They did not scatter, but went at once to the upper room where they abode. It seems this was a temporary residence that had been used when Jesus and His closest followers were in Jerusalem.
Book of Acts, Chapter 1, Verses 9-11 - Cloud of Witnesses
He departed visibly. He shall return visibly. He went to heaven; He will return from heaven. He went away bodily; He shall return bodily.
Book of Acts, Chapter 1, Verses 9-11 - Jesus' Ascension
The disciples already had His promise of a SPIRITUAL return to be IN them, but this was different.  The angels speak of another PHYSICAL return of the Lord.
Book of Acts, Chapter 1, Verses 6-8 - Pentecostal Power
Ordinary people were able to do extraordinary things because the Spirit of God was at work in their lives.  The ministry of the Holy Spirit is not a luxury; it is an absolute necessity 
Book of Acts, Chapter 1, Verses 6-8 - Missionary Intent
That the residents of Samaria hear the gospel was more important to Jesus than the restoration of the kingdom to Israel would have been beyond the disciples’ imagination. 
Book of Acts, Chapter 1, Verses 6-8 - The Remedy for Self Interest
Pentecost changed the entire outlook of these men.
Book of Acts, Chapter 1, Verses 6-8 - Are You in the Same Business God is in?
The light that shines the farthest shines the brightest at home.
Book of Acts, Chapter 1, Verses 6-8 - Wilt Thou Restore the Kingdom?
Imagine them thinking and talking among themselves, ”You know that resurrection was a pretty neat trick, but I wonder when He is going to take care of the ‘main’ thing, the business of restoring the kingdom to Israel?”
Book of Acts, Chapter 1, Verses 3-5 - Tarrying at a Promise
The main difference between John and the book of Acts disciples was that the disciples had experienced a personal Pentecost – they had been filled with the Holy Ghost.  Empowered by the Holy Ghost, the disciples could exclaim, “I can do all things through Christ which strengtheneth me” (Philippians 4:13).
Book of Acts, Chapter 1, Verses 3-5 - Principles Established
As the group near the ascension of the Lord, He gave specific instruction as to where they were to go and what they were to wait for. What had been spoken of just over 40 days earlier would soon be a reality.
Book of Acts, Chapter 1, Verses 3-5 - Speaking of Things Pertaining to the Kingdom of God
Books have been written about the last words of various people. God manifest in flesh spent His last days on earth focused on, “the things pertaining to the kingdom of God.” 
Book of Acts, Chapter 1, Verses 3-5 - The Next Thing
God does not always inform us as to the “so that” intended as the next step forward, but never stop looking for God’s “so that” in your life. You ran into an old friend last week. Was the intent to get an update on their family? Perhaps, or was something else meant to happen?
Book of Acts, Chapter 1, Verses 3-5 (continued) - Infallible Proofs
Infallible proofs were provided to the apostles. By extension, I can choose to believe and accept these infallible proofs though I did not see this proof for myself.
Book of Acts, Chapter 1, Verses 3-5
Where else does Acts or the gospels speak of the promise of the Father?