Contradiction with Proverbs 11:24
This verse discusses withholding more than is right and implies loss, seeming to contradict the notion of not forgetting to share in Hebrews 13:16.
Proverbs 11:24: There is that scattereth, and yet increaseth; and [there is] that withholdeth more than is meet, but [it tendeth] to poverty.
Contradiction with Matthew 6:1
Encourages doing good deeds in secret, which can seem at odds with Hebrews 13:16's directive to publicly share and do good.
Matthew 6:1: Take heed that ye do not your alms before men, to be seen of them: otherwise ye have no reward of your Father which is in heaven. [alms: or, righteousness] [of your: or, with your]
Contradiction with 2 John 1:10-11
Advises against greeting or helping those who do not follow correct doctrine, potentially contradicting the unconditional sharing and doing good in Hebrews 13:16.
2 John 1:10-11: If there come any unto you, and bring not this doctrine, receive him not into [your] house, neither bid him God speed: