Matthew 21:22 promises that believing prayer is answered — closely paralleling the promise in Matthew 18:19 about agreed prayer.

Mark 11:24 teaches that believing prayer receives what is asked — a direct parallel to the agreement-based prayer promise in Matthew 18:19.

John 14:13 promises whatever you ask in Jesus' name — a parallel prayer promise, here with the specific condition of asking in his name.

John 14:14 repeats the promise of answered prayer in Jesus' name — reinforcing the same theme without the element of mutual agreement.

John 15:7 adds the condition of abiding in Christ for answered prayer, paralleling the agreement condition here.

John 16:23 says the Father will give whatever you ask in Jesus' name — another parallel promise, emphasizing direct access through Christ.

Acts 4:31 shows the early church praying together and receiving boldness — a clear example of Jesus' promise that united prayer is answered.

Acts 12:12 shows the church gathered in prayer for Peter — a practical example of the united prayer Jesus promises to answer.

Daniel 2:18 shows Daniel and friends agreeing in prayer for revelation — a precedent for Jesus' promise that united prayer is heard.