This article consists of notes on Lord's Day 38 of the Heidelberg Catechism.

We all know the expression taken from Lord's Day 38 of the Heidelberg Catechism, in answer to the question “What does God require in the fourth commandment?” “first that, especially on the day of rest, I diligently attend the church of God to hear God’s Word, to use the sacraments, to call publicly upon the LORD, and to give Christian offerings for the poor.”. This article pays attention to the expression “that, especially on the day of rest, I diligently attend the church of God."