John Gill Commentary Mark 14:31

"But he spake exceedingly vehemently, If I must die with thee, I will not deny thee. And in like manner also said they all." — Mark 14:31 (ASV)

But he spoke the more vehemently With a louder voice; with more spirit and eagerness; in a more peremptory and self-confident way.

If I should die with you, I will not deny you in any way. The Syriac version adds, "O my Lord", my dear Lord, I will never deny you upon any consideration whatever; and the Persic version, O Lord:

likewise also they all said; as he said, so said "all the disciples", as the Syriac version reads it; (See Gill on Matthew 26:35).