Robert Herrick - COCK-CROW

Bell-man of night, if I about shall go
For to deny my Master, do thou crow!
Thou stop'st Saint Peter in the midst of sin;
Stay me, by crowing, ere I do begin;
Better it is, premonish'd, for to shun
A sin, than fall to weeping when 'tis done.

Robert Herrick

http://www.poemhunter.com/poem/cock-crow-2/