Jude 1:20

“But ye, beloved, etc.] (See Gill on “<650117>Jude 1:17”); building up yourselves on your most holy faith; some copies, and the Complutensian edition, read, “our most holy faith”; meaning the doctrine of faith in all its branches, which is holy, a most holy doctrine; which displays the holiness of God, and is a means of beginning and increasing internal holiness in the saints, and of encouraging and exciting them to external holiness of life and conversation: this phrase, açydq atwnmyhm, “holy faith”, is in use with the Jews f34: and it becomes the saints to build up one another upon this; the doctrine of faith, is a foundation to build upon, particularly what regards the person, offices, and…”

“Resuming Jde 1:17. building up yourselves--the opposite to the "separate themselves" (Jde 1:19): as "in the Holy Ghost" is opposed to "having not the Spirit." on--as on a foundation. Building on THE FAITH is equivalent to building on Christ, the object of faith. praying in the Holy Ghost-- (Rom 8:26; Eph 6:18). The Holy Spirit teaches what we are to pray for, and how. None can pray aright save by being in the Spirit, that is, in the element of His influence. CHRYSOSTOM states that, among the charisms bestowed at the beginning of the New Testament dispensation, was the gift of prayer, bestowed on someone who prayed in the name of the rest, and taught others to pray. Moreover, their prayers so…”

“But ye, beloved, building up yourselves on your most holy faith - Compare the notes at Jude 1:3. On the word “building,” see the 1 Corinthians 3:9-10 notes; Ephesians 2:20 note. It is said here that they were to “build up themselves;” that is, they were to act as moral and responsible agents in this, or were to put forth their own proper exertions to do it. Dependent, as we are, and as all persons with correct views will feel themselves to be, yet it is proper to endeavor to do the work of religion as if we had ample power of ourselves. See the notes at Philippians 2:12. The phrase “most holy faith” here refers to the system of religion which was founded on faith; and the meaning is, that…”

“But ye, beloved, not separating, but building yourselves up in your most holy faith - Than which none can be more holy in itself, or more conducive to the most refined and exalted holiness. Praying through the Holy Spirit - Who alone is able to build you up, as he alone laid the foundation. In this and the following verse St. Jude mentions the Father, Son, and Spirit, together with faith, love, and hope. Jude 1:21”

“1:20 your most holy faith: As in 1:3, faith refers to what Christians believe, the doctrinal and ethical core of Christian identity, which false teachers threaten. Believers must therefore devote themselves to it.”

“building: Act 9:31; Rom 15:2; Co1 1:8, Co1 10:23, Co1 14:4, Co1 14:5, Co1 14:26; Eph 4:12, Eph 4:16, Eph 4:29; Col 2:7; Th1 5:11; Ti1 1:4, Gr most: Act 15:9, Act 26:18; Ti2 1:5; Tit 1:1; Jam 2:22; Pe2 1:1; Jo1 5:4; Rev 13:10 praying: Zac 12:10; Rom 8:15, Rom 8:26, Rom 8:27; Co1 14:15; Gal 4:6; Eph 6:18 Jude 1:21”