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2:17 being poured out. From the Gr. that means “to be offered as a libation or drink offering.” Some connect this with Paul’s future martyrdom, but the verb is in the present tense, which means he is referring to his sacrificial ministry among the Philippians. drink offering. This refers to the topping off of an ancient animal sacrifice. The offerer poured wine either in front of or on top of the burning animal and the wine would be vaporized. That steam symbolized the rising of the offering to the deity for whom the sacrifice was made (cf. Ex. 29:38–41; 2 Kin. 16:13; Jer. 7:18; Hos. 9:4). Paul viewed his entire life as a drink offering, and here it was poured on the Philippians’ sacrificial service. service of your faith. “Service” comes from a word that refers to sacred, priestly service (cf. Rom. 12:1; 1 Cor. 9:12) and was so used in the Gr. OT. Paul sees the Philippians as priests who were offering their lives sacrificially and faithfully in service to God (cf. 1 Pet. 2:9).

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The libation-wine, set apart from its common use, serving as an expression of joy (Ps. 104:15; Eccles. 10:19), as an image of quickening grace (Prov. 9:2; Isaiah 55:1), as a sweet savor (2 Cor. 3:15; Rom. 15:16), serves to represent the Apostle (separated from them by his δεσμοί), as giving up his personal and official ego, his life and his desires, pouring out in a martyr’s death his blood as a sweet savor.

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My life’s blood is to be poured out like an offering translates a single Greek verb, which means literally “I am poured out” (that is, as a libation or drink offering). The drink offering was usually a cup of wine poured out on the ground to honor a deity. When used of a person, the verb denotes a violent or bloody death. This kind of offering was common in both pagan and Jewish worship (cf. Num 15.3–10). In talking about the possibility of his martyrdom, Paul likens his life’s blood to a drink offering poured out to honor God (cf. Rom 15.16; 2 Tim 4.6).
The possibility of death is for Paul not a cause for grief, but of joy. This joy is based on the confidence that death will be a gain, because by it Christ will be glorified and the gospel proclaimed. Here again we have the characteristic refrain of this letter, “joy” and “you all.” In this verse and the following, Paul employs the verb “to rejoice” twice, and also its compound “to rejoice with” twice. Here he says I am glad and share my joy with you all.
If that is so refers, not to the sacrifice that your faith offers to God, but to the possibility of Paul’s death. Therefore if that is so may by rendered as “if that turns out to be the case,” or “if I die.”