3 John 1:5

³ For I rejoiced greatly, when the brethren came and testified of the truth that is in thee, even as thou walkest in the truth.

⁴ I have no greater joy than to hear that my children walk in truth.

Beloved, thou doest faithfully whatsoever thou doest to the brethren, and to strangers;

⁶ Which have borne witness of thy charity before the church: whom if thou bring forward on their journey after a godly sort, thou shalt do well:

⁷ Because that for his name’s sake they went forth, taking nothing of the Gentiles.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: Beloved, you are faithful in what you are doing for the brothers, and especially since they are strangers to you.
KJV: Beloved, thou doest faithfully whatsoever thou doest to the brethren, and to strangers;
WEB: Beloved, you do a faithful work in whatever you accomplish for those who are brothers and strangers.
ASV: Beloved, thou doest a faithful work in whatsoever thou doest toward them that are brethren and strangers withal;
DARBY: Beloved, thou doest faithfully [in] whatever thou mayest have wrought towards the brethren and that strangers,
BLB: Beloved, you are doing faithfully whatever you might work for the brothers, and they are strangers,

ÅB: Du elskede! du gjør en trofast gjerning med det du gjør imot brødrene, enda de er fremmede,
OTB: Kjære venn, du er trofast i det du gjør for brødrene og søstrene, selv om de er fremmede for deg;
B1930: Du elskede! du gjør en trofast gjerning med det du gjør imot brødrene, enda de er fremmede,

Galatians 6:10
As we have therefore opportunity, let us do good unto all men, especially unto them who are of the household of faith.
Read in context
Luke 12:42
And the Lord said, Who then is that faithful and wise steward, whom his lord shall make ruler over his household, to give them their portion of meat in due season?
Read in context
Luke 16:10–12
He that is faithful in that which is least is faithful also in much: and he that is unjust in the least is unjust also in much.
Read in context
Colossians 3:17
And what soever ye do in word or deed, do all in the name of the Lord Jesus, giving thanks to God and the Father by him.
Read in context
Matthew 24:45
Who then is a faithful and wise servant, whom his lord hath made ruler over his household, to give them meat in due season?
Read in context
2 Corinthians 4:1–3
Therefore seeing we have this ministry, as we have received mercy, we faint not;
Read in context
1 Peter 4:10–11
As every man hath received the gift, even so minister the same one to another, as good stewards of the manifold grace of God.
Read in context