Genesis 24

 I am impressed with the faith of the servant of Abraham as he prayed - 

"...O Lord God of my master Abraham, I pray thee, send me good speed this day, and shew kindness unto my master Abraham.

13 Behold, I stand here by the well of water; and the daughters of the men of the city come out to draw water:

14 And let it come to pass, that the damsel to whom I shall say, Let down thy pitcher, I pray thee, that I may drink; and she shall say, Drink, and I will give thy camels drink also: let the same be she that thou hast appointed for thy servant Isaac; and thereby shall I know that thou hast shewed kindness unto my master."  (Genesis 24:12–14)

It's interesting that he didn't just pray for help but actually proposed a plan.  The Lord accepted that plan as - 

"...before he had done speaking, that, behold, Rebekah came out, who was born to Bethuel, son of Milcah, the wife of Nahor, Abraham’s brother, with her pitcher upon her shoulder.

16 And the damsel was very fair to look upon, a virgin, neither had any man known her: and she went down to the well, and filled her pitcher, and came up.

17 And the servant ran to meet her, and said, Let me, I pray thee, drink a little water of thy pitcher.

18 And she said, Drink, my lord: and she hasted, and let down her pitcher upon her hand, and gave him drink.

19 And when she had done giving him drink, she said, I will draw water for thy camels also, until they have done drinking.

20 And she hasted, and emptied her pitcher into the trough, and ran again unto the well to draw water, and drew for all his camels."  (Genesis 24:15–20)