'Weak' in the Bible

And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sara's womb:

For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:

Him that is weak in the faith receive ye, but not to doubtful disputations.

For one believeth that he may eat all things: another, who is weak, eateth herbs.

It is good neither to eat flesh, nor to drink wine, nor any thing whereby thy brother stumbleth, or is offended, or is made weak.

We then that are strong ought to bear the infirmities of the weak, and not to please ourselves.