Psalms 1 2
But his delight is in the law of the Lord, And on His law [His precepts and teachings] he [habitually] meditates day and night.
Compare with other 3 random translations
NIV Psalms 1:2but whose delight is in the law of the Lord, and who meditates on his law day and night.
EAS Psalms 1:2He is happy when he obeys the Law of the Lord. He thinks about God's Law during the day and at night.
NAS Psalms 1:2But his delight is in the Law of the Lord, And on His Law he meditates day and night.