'Surplus' in the Bible

because all of them contributed out of their surplus, but out of her poverty she has given everything she had to live on."

because all the others contributed to the offering out of their surplus, but she, in her poverty, dropped in everything she had to live on."

After the Sabbath ends, each of you should set aside and save something from your surplus in proportion to what you have, so that no collections will have to be made when I arrive.

At the present time, your surplus fills their need, so that their surplus may fill your need. In this way things are fair.