salvation
( See Scofield) - (Romans 1:16).
it was needful
Literally, constraint was upon me, that is, of the Spirit.
Related Commentaries of Jude 1:3
Jude 1:3
3 Beloved, when I gave all diligence to write unto you of the common salvation, it was needful for me to write unto you, and exhort [you] that ye should earnestly contend for the faith which was once delivered unto the saints.