Jude 1 3
Beloved, while I was very diligent to write to you concerning our common salvation, I found it necessary to write to you exhorting you to contend earnestly for the faith which was once for all delivered to the saints.
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AMP Jude 1:3Beloved, my whole concern was to write to you in regard to our common salvation. [But] I found it necessary and was impelled to write you and urgently appeal to and exhort [you] to contend for the faith which was once for all handed down to the saints [the faith which is that sum of Christian belief which was delivered verbally to the holy people of God].