It is narrated from Bilal bin Sa’d Al-Ash’ari (may Allah have mercy on him) that Sayyiduna Muawiyah (may Allah be pleased with him) wrote to Sayyiduna Abu Darda (may Allah be pleased with him) asking him to send the names of the wicked (evil) people of Damascus. He replied: What concern do I have with the wicked people of Damascus? How would I recognize them? His son Bilal (may Allah have mercy on him) said: I will write their names. So he wrote their names. Sayyiduna Abu Darda (may Allah be pleased with him) asked: How did you come to know about them? How did you know that they are wicked, unless you are one of them? Therefore, write your own name first. And so, he did not send the names.