Answer
The first recorded occurrence of a drink offering was that given by Jacob in Genesis 35:14, right after God changed his name to Israel. Drink offerings were also included with burnt and grain offerings in God-ordained sacrifices, including the morning and evening sacrifices of Exodus 29:40. One-quarter hin, about one quart, of wine was poured out into the altar fire for each lamb sacrificed (Numbers 15:4-5). A ram sacrifice required one third of a hin (Numbers 15:6), and a bull required one half (Numbers 15:10).
It has been speculated that the offering of an animal, grain, oil, and wine—the smoke making a “soothing aroma to the LORD”—is a metaphor for providing food for God, an important cultural requirement in the Middle East. What we do know is that the pouring out of a drink offering is a metaphor for the blood Jesus spilled on the cross. Jesus spoke to this directly in Luke 22:20 when He instituted the New Covenant. He picked up a cup of wine and said, “This cup which is poured out for you is the new covenant in My blood.” Jesus’ sacrifice fulfilled the need of a drink offering, His blood literally pouring out when the soldier pierced His side with a spear (John 19:34).
Paul took the metaphor further, twice using the image of a drink offering to describe his own service. In Philippians 2:17, he challenged the church in Philippi to live a life worthy of his dedication to them. In 2 Timothy 4:6, he sensed the end of his ministry, again comparing his efforts to wine poured out of a vessel onto an altar.
