Matthew 23:5
And everything they do they do with a view to being observed by men; for they widen their phylacteries and make the tassels large,
Colossians 3:16
Let the teaching concerning Christ remain as a rich treasure in your hearts. In all wisdom teach and admonish one another with psalms, hymns, and spiritual songs, and sing with grace in your hearts to God.
Hebrews 2:1
For this reason we ought to pay the more earnest heed to the things which we have heard, for fear we should drift away from them.
2 Peter 1:12
For this reason I shall always persist in reminding you of these things, although you know them and are stedfast believers in truth which you already possess.
2 Peter 3:1-2
This letter which I am now writing to you, dear friends, is my second letter. In both my letters I seek to revive in your honest minds the memory of certain things,