1 Kings 2:3

keep the charge of the Lord The word rendered -charge" here has no connexion with the verb used in 1 Kings 2:1, but is the customary expression in the Book of Numbers for the care and oversight of the Tabernacle and other things committed to the Levites. (See Numbers 1:53; Numbers 3:7-8 &c.) It is used also of other sacred offices and the duties attached thereto. Thus is imported into the word a solemn signification, though in etymology it is connected with the word which precedes it, rendered -keep".

to keep his statutes, and his commandments, and his judgements These words appear to refer to the three portions of the divine law, the ceremonial, the moral, and the judicial ordinances revealed by God in the Mosaic code; while testimoniesmay be interpreted of those evidences of God's will towards man which are made clear by His dealings with bygone generations. Thus God in His word bears witness to Himself.

asit is written in the law of Moses The allusion is to Deuteronomy 17:18-20, where the king, in time to come, is bidden to keep a copy of the Law, and to study it, that so his days may be prolonged.