Q. 9. What is the work of creation?

A. The work of creation is, God’s making all things of nothing, by the word of his power [a], in the space of six days, and all very good. [b]

[a]. Gen. 1:1; Ps. 33:6, 9; Heb. 11:3

[b]. Gen. 1:31

Source https://www.apuritansmind.com/westminster-standards/shorter-catechism/