Jaldi ka kaam shaitan ka aur der ka kaam Rahman ka. Haste is the work of the devil, and delay is the work of the Merciful. The Rekhta dictionary explains that people say it when someone hurries, because work done in haste is more likely to go wrong.
Sabr ka phal meetha hota hai. The fruit of patience is sweet. Rekhta’s Hindi gloss: patience brings a good result.