A. There is but one only [a], the living and true God [b].

[a]. Deut. 6:4; Isa. 44:6; 45:21-22; 1 Cor. 8:4-6

[b]. Jer. 10:10; John 17:3; 1 Thess. 1:9; 1 John 5:20


Source: https://wearereformed.com/category/westminster-shorter-catechism/