The Talmud cites proof from a baraita in support of the opinion of Rabbi Yosei son of Rabbi Hanina that the patriarchs instituted the prayers.

It was taught in a baraita in accordance with the opinion of Rabbi Yosei son of Rabbi Hanina: Abraham instituted the morning prayer, as it is stated: “Abraham arose early in the morning to the place where he stood before the Lord” (Genesis 19:27), and the verb standing in this verse means nothing other than prayer. The proof for this is that it is stated: “Pinhas stood up to carry out judgment, and the plague was stopped” (Psalms 106:30). Just as the verb “stood” is used in the context of Pinhas’s prayer to halt the plague, here too, when Abraham stood early in the morning it was for the purpose of prayer.

Isaac instituted the afternoon prayer, as it is stated: “Isaac went out to walk [lasuah] in the field toward evening” (Genesis 24:63), and the term siha in this verse means nothing other than prayer. And the proof is that it is stated: “The prayer of a poor man, when he feels overwhelmed and pours out his woes [siho] before the Lord” (Psalms 102:1). This indicates that Isaac was the first to pray as evening approached, at the time of the afternoon prayer.

Jacob instituted the evening prayer, as it is stated: “He came upon [vayifga] the place, and stayed the night there because the sun had set” (Genesis 28:11), and the term pegia in this verse means nothing other than prayer. And the proof is that it is stated, when God spoke to the prophet Jeremiah: “And you, do not pray on behalf of this people, and do not lift up a cry or a prayer on their behalf, and do not plead [tifga] with Me, for I am not listening to you” (Jeremiah 7:16).