Sat: this word may note either, first, His bodily posture, for there is no certain gesture to which prayer is limited and we have examples of saints praying in that posture, Exodus 17:12 1 Kings 19:4; or he might sit for a season whilst he was meditating upon these things, and then alter his posture, (though it be not here expressed,) and betake himself to prayer. Or rather, secondly, His continuance, as this Hebrew word is oft used, as Genesis 22:11 Leviticus 14:8 1 Samuel 1:22, 1 Samuel 20:19, that he did not barely present himself before God but abode there for some competent time, that he might with God's leave pour out his soul freely before him. For howsoever one may in some cases pray sitting, yet it is most probable that David would in this holy place, and upon this occasion, use a more humble and reverent gesture, such as kneeling is, which therefore David prescribeth or adviseth, Psalms 95:6 and Solomon accordingly practiseth, 1 Kings 8:54 2 Chronicles 6:13. Who am I, and what is my house, that thou hast brought me hitherto? how indefinitely unworthy am I and my family of this great honour and happiness!
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?