Jude 1:20

¹⁸ when they said to you, “In the last times there will be scoffers who will follow after their own ungodly desires.”

¹⁹ These are the ones who cause divisions, who are worldly and devoid of the Spirit.

But you, beloved, by building yourselves up in your most holy faith and praying in the Holy Spirit,

²¹ keep yourselves in the love of God as you await the mercy of our Lord Jesus Christ to bring you eternal life.

²² And indeed, have mercy on those who doubt;

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

Compare

BSB: But you, beloved, by building yourselves up in your most holy faith and praying in the Holy Spirit,
KJV: But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Ghost,
WEB: But you, beloved, keep building up yourselves on your most holy faith, praying in the Holy Spirit.
ASV: But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Spirit,
DARBY: But *ye*, beloved, building yourselves up on your most holy faith, praying in the Holy Spirit,
BLB: But you⁺, beloved, building up yourselves in your⁺ most holy faith, praying in the Holy Spirit,

ÅB: Men dere, elskede, oppbygg dere selv på deres høyhellige tro, be i den Hellige Ånd,
OTB: Men dere, kjære, ved å bygge dere opp i deres mest hellige tro, be i Den Hellige Ånd,
B1930: Men I, elskede, opbygg eder på eders høihellige tro, bed i den Hellige Ånd,

Ephesians 6:18
Pray in the Spirit at all times, with every kind of prayer and petition. To this end, stay alert with all perseverance in your prayers for all the saints.
Read in context
Romans 8:26–27
In the same way, the Spirit helps us in our weakness. For we do not know how we ought to pray, but the Spirit Himself intercedes for us with groans too deep for words.
Read in context
1 Corinthians 14:15
What then shall I do? I will pray with my spirit, but I will also pray with my mind. I will sing with my spirit, but I will also sing with my mind.
Read in context
Colossians 2:7
rooted and built up in Him, established in the faith as you were taught, and overflowing with thankfulness.
Read in context
1 Thessalonians 5:11
Therefore encourage and build one another up, just as you are already doing.
Read in context
1 Corinthians 14:4–5
The one who speaks in a tongue edifies himself, but the one who prophesies edifies the church.
Read in context
Romans 8:15
For you did not receive a spirit of slavery that returns you to fear, but you received the Spirit of sonship, by whom we cry, “Abba! Father!”
Read in context
Acts 9:31
Then the church throughout Judea, Galilee, and Samaria experienced a time of peace. It grew in strength and numbers, living in the fear of the Lord and the encouragement of the Holy Spirit.
Read in context