'Needy' in the Bible

‘They are fat and they are sleek (prosperous),They excel in acts of wickedness;They do not plead the cause,The cause of the orphan, so that they [the wicked] may prosper,And they do not defend the rights of the poor.

Sing to the Lord! Praise the Lord!For He has rescued the life of the needy oneFrom the hand of evildoers.

“He defended the cause of the afflicted and needy;Then all was well.Is that not what it means to know Me?”Says the Lord.