Nothing is to be done out of jealousy or vanity; instead, out of humility of mind everyone should give preference to others, everyone pursuing not selfish interests but those of others.

[μηδὲν κατ᾽ ἐριθείαν μηδὲ κατὰ κενοδοξίαν ἀλλὰ τῇ ταπεινοφροσύνῃ ἀλλήλους ἡγούμενοι ὑπερέχοντας ἑαυτῶν, μὴ τὰ ἑαυτῶν ἕκαστος σκοποῦντες ἀλλὰ [καὶ] τὰ ἑτέρων ἕκαστοι.]

The Bible (The New Testament) (AD 1st - 2nd C) Christian sacred scripture

Philippians 2: 3-4 [NJB (1985)]
    (Source)

(Source (Greek)). Alternate translations:

Let nothing be done through strife or vainglory; but in lowliness of mind let each esteem other better than themselves. Look not every man on his own things, but every man also on the things of others.
[KJV (1611)]

There must be no competition among you, no conceit; but everybody is to be self-effacing. Always consider the other person to be better than yourself, so that nobody thinks of his own interests first but everybody thinks of other s people's interests instead.
[JB (1966)]

Don't do anything from selfish ambition or from a cheap desire to boast, but be humble toward one another, always considering others better than yourselves. And look out for one another's interests, not just for your own.
[GNT (1992 ed.)]

Don’t do anything for selfish purposes, but with humility think of others as better than yourselves. Instead of each person watching out for their own good, watch out for what is better for others.
[CEB (2011)]

Do nothing from selfishness or empty conceit, but with humility consider one another as more important than yourselves; do not merely look out for your own personal interests, but also for the interests of others.
[NASB (2020 ed)]

Do nothing from selfish ambition or empty conceit, but in humility regard others as better than yourselves. Let each of you look not to your own interests but to the interests of others.
[NRSV (2021 ed.)]