Anas bin Malik narrated that a man said:
"O Messenger of Allah! Shall I tie it and rely(upon Allah), or leave it loose and rely(upon Allah)?" He said: "Tie it and rely(upon Allah)." (TR)
English reference (TR): Vol. 4, Book 11, Hadith 2517 (TR)
Arabic reference (TR): Book 37, Hadith 2707 (TR)