Before He Finished Speaking
Standing alone at a well in Charan, Eliezer asked Hashem for a sign of chesed, and Rivka appeared before his prayer was done.
Eliezer reached the city of Nachor toward evening and made his camels kneel beside the well, at the hour when the women came out to draw water. He had no letter of introduction and no way of knowing which family was Avraham's. So he turned to the only One who could guide him. Hashem, God of my master Avraham, he prayed, arrange it for me today, and do kindness with my master. Let the girl to whom I say, Please lower your jar so I may drink, answer, Drink, and I will water your camels as well. Let her be the one You have chosen for Yitzchak.
Rashi explains what he was looking for: a woman who did chesed would be worthy to enter the house of Avraham. Before he had finished speaking, Rivka came out with her jar on her shoulder. The Midrash relates that as she went down to the spring, the water rose up toward her, and Eliezer, seeing it, ran to meet her.
He asked only for a sip. She said, Drink, my lord, lowered her jar, and when he had finished she ran back again and again until all ten camels had drunk their fill. Eliezer stood silent, watching, still unsure whether she was from Avraham's family. Then he asked whose daughter she was. When she answered, the daughter of Besuel, son of Nachor, he bowed to the ground and blessed Hashem, who had not withheld His kindness from his master and had led him straight to his master's family.
Chazal count this among three prayers that were answered the moment they were spoken.
Source: Bereishis 24:11–27 with Rashi (24:14, 24:17); Midrash Bereishis Rabbah 60:1–6; English: The Sefaria Midrash Rabbah (2022).
Eliezer's prayer was not for himself. He asked Hashem to do kindness with his master, and to show him a person of chesed. This week, when you are doing something for someone else, whether a favor, a job for your employer or a call on behalf of a friend, stop for one moment before you begin and say quietly: Hashem, let this go well for them. Then watch, as Eliezer did, for the small signs of kindness along the way, and thank Hashem when they come.