1 Peter 1:22-24

Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently: being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever. For All flesh is as grass, And all the glory of man as the flower of grass. The grass withereth, and the flower thereof falleth away