David said within himself, or in his own thoughts. Solomon is young and tender; and therefore, through youthful vanity, and folly, and unsettledness, may not use that care, and consideration, and diligence in making such provisions as this great work requires. Of Solomon's age, see 1 Kings 3:7.
Related Commentaries of 1 Chronicles 22:5
1 Chronicles 22:5
5 And David said, Solomon my son is young and tender, and the house that is to be builded for the LORD must be exceeding magnifical, of fame and of glory throughout all countries: I will therefore now make preparation for it. So David prepared abundantly before his death.