'Brother' in the Bible

The friend loves at all times, but a brother is born for adversity.

Even he who is slack in his work, he is brother to a master of destruction.

A brother who is offended [is worse] than a city of strength, and quarrels [are] like the bars of a fortification.

A man of [many] friends will come to ruin, but there is a friend who sticks closer than a brother.

As for your friend and a friend of your father, do not forsake [them], and the house of your brother, do not enter on the day of your calamity. Better is a close neighbor than a distant brother.