The Yamadutas were certain that Ajamila was a most sinful man, but although Yamaraja wanted to punish him, the Visnudutas excused him. This was a puzzling situation that the Yamadutas wanted Yamaraja to clarify
SB Canto 6
The Yamadūtas continued: Since there are many different karmīs, or workers, there may be different judges or rulers to give them justice, but just as one central emperor controls different departmental rulers, there must be one supreme controller to guide all the judges.
In governmental management there may be departmental officials to give justice to different persons, but the law must be one, and that central law must control everyone. The Yamadūtas could not imagine that two judges would give two different verdicts in the same case, and therefore they wanted to know who the central judge is. The Yamadūtas were certain that Ajāmila was a most sinful man, but although Yamarāja wanted to punish him, the Viṣṇudūtas excused him. This was a puzzling situation that the Yamadūtas wanted Yamarāja to clarify.