Philippians 4:1-3 Therefore, my brethren dearly beloved and longed for, my joy and crown, so stand fast in the Lord, my dearly beloved. I beseech Euodias, and beseech Syntyche, that they be of the same mind in the Lord. And I intreat thee also, true yokefellow, help those women which laboured with me in the gospel, with Clement also, and with other my fellow-labourers, whose names are in the book of life. 

‘Fellowlabourers’ [Greek: sunergos] fellowlaborer (4:3; 1Thess. 3:2; Phm. 1:1, 24); fellowworker (Col. 4:11); workfellow (Rom. 16:21); labourers together (1Cor. 3:9); companion in labour (2:25); fellowhelper (2Cor. 8:23; 3Jn. 1:8); and helper (Rom. 16:3, 9; 2Cor. 1:24).

‘Book of life’ – from Exodus 32:32-33 God confirmed Moses’ belief that names can and will be blotted out of the book of life when men incur the eternal death penalty. It is also the first mention of the book of God in which the names of the righteous are written. The psalmist predicted it in the case of Judas (Ps. 69:20-28). Christ warned of it regarding all who would not overcome sin (Rev. 3:5; 22:18-19). This – God’s word, not man’s – is definite, not doubtful; it is universal and eternal in the application, not local and limited.

It is referred to in Scripture under various terms: “Thy book” and “My book” (Ex. 32:32-33); “the book of the living” (Ps. 69:28); “the book” (Dan. 12:1); “the book of life” (Php. 4:3; Rev. 3:5; 13:8; 17:8; 20:11-15; 22:18-19); and “the Lamb’s book of life” (Rev. 21:27). Just because “book of life” does not appear in all of these passages does not mean the reference in any one instance is to something else. Just as we have several names for the Bible – “the holy scriptures” (Rom. 1:2; 2Tim. 3:15); “the oracles of God” (Rom. 3:2; Heb. 5:12; 1Pet. 4:11); “the law and the prophets” (Luke 24:25-44); “the word of God” (Mark 7:13; Rom. 10:17; Heb. 4:12); “the sword of the Spirit” (Eph. 6:17); and others – so we have several names for the book of life.