What will happen at the second coming of Jesus?

When Jesus returns, He will fulfill His role as the righteous judge, separating the righteous from the unjust. This is depicted in Mark 13:27, where it mentions that He will send His angels to gather His elect. Additionally, 1 Thessalonians 4:16-17 describes the resurrection of the dead in Christ and the gathering of believers to meet the Lord in the air. His return will usher in the establishment of God's eternal kingdom, marking both an end to human history as we know it and the beginning of everlasting communion with Him.