ALEPH. Blessed [are] the undefiled in the way, who walk in the law of the LORD.
Ver. 1. Blessed are the undefiled] Pindar and other poets had their Ogdoades or Oetonaries. This alphabetical poem (as Sixtus Senensis calleth it) is David's, doubtless (though it hath no title to show so much), written in the days of his banishment under Saul; and far more worthy to be written in letters of gold than Pindar's seventh ode, which that profane fellow Politian preferred before any psalm of David, the sweet singer of Israel. How much better his countryman Jacobus Furnius, who translated this psalm into Greek and Latin verses, in so many Octounties; and beginning each verse thereof with the same letter, after the manner of the Hebrew composure; which is very artificial, both for the excellence of the matter and for the help of memory. The Jews are said to teach it to their little ones being the first thing they learn; wherein they take a very right course, both in regard to the heavenly matter, and plain style fitted for all capacities. David (in his troubles especially) was a man much in meditation of God's word, and here he giveth us in his thoughts of it. When a book is set forth, verses of commendation are oft prefixed. David seemeth to set this Divine psalm as a poem of commendation before the Book of God; mentioning it in every verse (unless it be one only, Psa 119:122), under the name of testimonies, laws, statutes, word, judgments, precepts, &c.
Who walk in the law of the Lord] Who walk towards heaven in heaven's way; avoiding the corruptions that are in the world through lust, 2 Peter 1:4 .