Romans 4:19; Romans 8:3; Romans 14:1; Romans 14:2

Romans 4:19

19 Without becoming weak in faith he contemplated his own body, now as good as dead since he was about a hundred years old, and the deadness of Sarah's womb;

Romans 8:3

3 For what the Law could not do, weak as it was through the flesh, God did: sending His own Son in the likeness of sinful flesh and as an offering for sin, He condemned sin in the flesh,

Romans 14:1

1 Now accept the one who is weak in faith, but not for the purpose of passing judgment on his opinions.

Romans 14:2

2 One person has faith that he may eat all things, but he who is weak eats vegetables only.