One verse, a whole liturgy. Targum Pseudo-Jonathan on Genesis 24:63 translates the Hebrew word la-suach — which can mean "to meditate" or "to wander" — as something specific: Isaac "went forth to pray upon the face of the field at the time of evening."
To pray. At the time of evening. The Targum is doing something the Talmud will later formalize. In tractate Berakhot 26b, the Rabbis ask who instituted the three daily prayers and answer: Abraham instituted Shacharit (morning), Isaac instituted Minchah (afternoon), and Jacob instituted Ma'ariv (evening). The Minchah prayer — what every observant Jew still whispers at dusk — was born, they say, in this field, on this afternoon, on the day Isaac's bride was about to crest the horizon.
Think about the timing. Isaac is waiting for a wife he has never met. He does not know what Rebekah looks like. He does not know if the mission has succeeded. He does not know if Eliezer is even alive. And what does he do with that uncertainty? He walks out into a field, and he turns the uncertainty into prayer.
That is how afternoon prayer was born. Not in a sanctuary. Not in a crowd. In the in-between hour, in the middle of an anxious waiting, by a man who turned toward God instead of toward worry.
Then he lifts his eyes, and the camels are approaching. Prayer does not always summon the answer. But it is, almost always, what prepares you to recognize it when it arrives.