Heidelberg Catechism, 1563 . . .
 

Q1. What is your only comfort in life and in death?
A. That I am not my own,1 but belong—body and soul, in life and in death2—to my faithful Savior, Jesus Christ.3

He has fully paid for all my sins with his precious blood,4 and has set me free from the tyranny of the devil.5 He also watches over me in such a way6 that not a hair can fall from my head without the will of my Father in heaven;7 in fact, all things must work together for my salvation.8

Because I belong to him, Christ, by his Holy Spirit, assures me of eternal life9 and makes me wholeheartedly willing and ready from now on to live for him.10

1 1 Cor. 6:19-20
2 Rom. 14:7-9
3 1 Cor. 3:23; Titus 2:14
4 1 Pet. 1:18-19; 1 John 1:7-9; 2:2
5 John 8:34-36; Heb. 2:14-15; 1 John 3:1-11
6 John 6:39-40; 10:27-30; 2 Thess. 3:3; 1 Pet. 1:5
7 Matt. 10:29-31; Luke 21:16-18
8 Rom. 8:28
9 Rom. 8:15-16; 2 Cor. 1:21-22; 5:5; Eph. 1:13-14
10 Rom. 8:1-17