en_tn_condensed/act/04/25.md

You spoke by the Holy Spirit through the mouth of your servant, our father David

This means that the Holy Spirit caused David to speak or write down what God said.

our father David

Here the word "father" refers to an ancestor.

Why did the Gentile nations rage, and the peoples imagine useless things?

"The Gentile nations should not have raged, and the peoples should not have imagined useless things against God"