But even if I am being poured out as a drink offering upon the sacrifice and service of your faith, I rejoice and share my joy with you all. You too, I urge you, rejoice in the same way and share your joy with me.”
‭‭Philippians‬ ‭2:17-18‬ ‭NASB

Paul was referring back to the Old Testament drink offering that would accompany offerings and sacrifices to God.  In Genesis 35:14 Jacob sets up a stone pillar at the place where God talked with him and he poured wine and olive oil over it as an offering. In Exodus 29:40 flour, olive oil, and wine were to be poured out along with the one year lamb as a sacrifice. In Numbers 15:5-10 we read of three different measures of wine to be used with a lamb, a ram, or a bull. Paul didn't mind being poured out as an offering in service to the Lord! His pouring out of himself in the cause of the gospel of Jesus Christ to the Philippians was, indeed, an honor. In fact, it was a joy. He encouraged the Philippian believers to consider their service to God as an offering of  joy as well. Jesus blood was poured out willfully for us. In Luke 22:20 we read “And in the same way He took the cup after they had eaten, saying, "This cup which is poured out for you is the new covenant in My blood.” NASB‬‬ In John 19:34 we also read this: “But one of the soldiers pierced His side with a spear, and immediately blood and water came out.” NASB‬‬ The ultimate sacrifice is Jesus Christ. He poured out Himself for our redemption and salvation. Our service to Him is our way of pouring out our lives in thankful offering. We should consider it utter joy to pour out our lives for Him!!