I think it is "工欲善其事 必先利其器"
工 = 工匠 (craftsman)
欲善其事 (want to do his job well)
必先 (must first)
利其器 (make his tools sharp, meaning in good condition)
This saying is using "To do a good job, a craftsman must sharpen his tools" as an analogy for "To be successful, one must first prepare his tools (make preparation)"-- 'Sharpen tools' is a metaphor for '...