It pleased God, in His eternal purpose, to choose and ordain the Lord Jesus, His only begotten Son, according to the covenant made between them both, to be the mediator between God and man; the prophet, priest, and king; head and savior of the church, the heir of all things, and judge of the world; unto whom He did from all eternity give a people to be His seed and to be by Him in time redeemed, called, justified, sanctified, and glorified.

Section 8.1 of the 1689 Baptist Confession of Faith

For further reading:

• Isaiah 42:1, 53:10; Psalm 2:6
• 1 Peter 1:19-20; Acts 3:22, 17:31; Hebrews 1:2, 5:5-6; Luke 1:33; Ephesians 1:22-23; John 17:6; Romans 8:30