'Messengers' in the Bible

When John's messengers had departed, he began to tell the multitudes about John, "What did you go out into the wilderness to see? A reed shaken by the wind?

and sent messengers before his face. They went, and entered into a village of the Samaritans, so as to prepare for him.

In the same way, wasn't Rahab the prostitute also justified by works, in that she received the messengers, and sent them out another way?