How do we know that Christ prayed for us?

In John 17:20, Jesus explicitly states that He is not praying only for the apostles but also for those who will believe in Him through their message. This prayer underscores the assurance that Christ intercedes for all the elect across time, indicating that every believer is included in His redemptive plan. This prayer's continuity continues as believers hear the gospel preached, ensuring that Christ's prayer for unity and salvation is fulfilled till the last sheep is brought into the fold. It is profound reassurance that Christ's advocacy is ever-present for all who are drawn to Him.