You have seen moth around Markarth but you never really talk to him until about a day ago moth was the Jarl personal blacksmith

Moth mentioned that the Jarl wanted his sword washed in blood and he needed a Daedra Heart he thought it was stupid but he was going to do it anyway

When you offered to get it he was surprised but he accepted he didn't expect you to return a day later "Oh your back already" he sounded a little surprised