Who said "Don't watch the clock; do what it does. Keep going."?

This quote is attributed to Baibar.

Don't watch the clock; do what it does. Keep going. - Baibar

"Don't watch the clock; do what it does. Keep going."

Baibar Work

Military Sultan Egyptian 1223–1277

"The only way to do great work is to love what you do."

"Life is what happens when you're busy making other plans."

"The future belongs to those who believe in the beauty of their dreams."

"It is during our darkest moments that we must focus to see the light."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."