Contradiction with Philippians 2:14
This verse encourages believers to do all things without murmuring and disputing, while Mark 14:19 describes the disciples questioning and being sad.
Philippians 2:14: Do all things without murmurings and disputings:
Contradiction with Proverbs 17:22
This verse states a cheerful heart is good medicine, but Mark 14:19 involves sadness and distress among the disciples.
Proverbs 17:22: A merry heart doeth good [like] a medicine: but a broken spirit drieth the bones. [like: or, to]
Contradiction with 1 Thessalonians 5:16-18
These verses urge believers to rejoice always and give thanks, which contrasts with the sorrowful and questioning reaction in Mark 14:19.
1 Thessalonians 5:16-18: Rejoice evermore.