Sat before the Lord - In the tent where the ark was. Standing or kneeling was the usual attitude of prayer (1Ki 8:22, 1 Kings 8:54-55; but compare Exodus 17:12). Modern commentators mostly take the word here in the sense of waiting, abiding, not sitting: but sat is the natural rendering. David sat down to meditate, and then rose up to pray.
Related Commentaries of 2 Samuel 7:18
2 Samuel 7:18
18 Then went king David in, and sat before the LORD, and he said, Who am I, O Lord GOD? and what is my house, that thou hast brought me hitherto?