ISB ~ Matthew 6 v1 - 18
Jesus reaffirms three traditional works of mercy honored by Jews (cf. Tob 12:8-10):almsgiving (6:2-4), prayer (6:5-15), and fasting (6:16-18) (cCC 1434, 1969).
piety:Literally “righteousness”, as in 3:15; 5:6, 20; 6:33.
See word study:Righteousness at Mt 3. Jesus does not challenge these practices in themselves; he warns against performing them for public esteem (CCC 1430).