Yes, the Bible does say to treat others as you want them to treat you. This is often referred to as the "Golden Rule."
It appears in the Gospel of Matthew, in the Sermon on the Mount:
* Matthew 7:12: "So whatever you wish that others would do to you, do also to them, for this is the Law and the Prophets."
A similar statement, though phrased negatively, is found in Luke:
* Luke 6:31: "And as you wish that others would do to you, do so to them."
These verses express the core principle of reciprocity and empathy.