How do we know Jesus prayed for our forgiveness?

We know that Jesus prayed for our forgiveness because, in John 17:9, He directly states that He prays for those given to Him by the Father, not for the world. This is a clear indication that His intercessory prayer is particular, aimed at His elect. In Luke 23:34, when Jesus prays, 'Father, forgive them,' He is praying for those whom the Father has chosen for salvation. His sacrifice and the basis of His prayer for forgiveness rest upon His atoning work, demonstrating that those named in His prayer are indeed recipients of divine mercy and grace, as His intercession effectively applies His redemptive work.