And there came running from the farthest part of the town, a man" And His saying: And there came a man running

Question :

Please clarify who the two men are in the following verses; also, please explain the meaning of the verses:
"And there came running from the farthest part of the city, a man saying: "O my people! Obey the Messengers."

"And there came a man running, from the farthest end of the city. He said: "O Musa! Verily the chiefs are taking counsel together about you, to kill you, so escape. Truly, I am to you of those whe give sincere advice."

A First, we must know that whenever a person is mentioned unnamed either in the Qur'an or in the Sunnah, we must not preoccupy ourselves in finding out the name of that person, but rather we should concentrate on the story, on the reason why the story was related, and on what morals we can learn from the story. In the verse of Surat Al-Qasas:
"And there came a man running, from the farthest end of the city".

And in Surah Ya Sin:
"And there came running from the farthest part of the city, a man..

So in Surat Al-Qasas a man came running, and another one in Surah Ya Sin. The point here is that Allah Almighty did not inform us in the Qur'an about who the man was in the first or in the second story. There is no real benefit in knowing who the man was, so rather than busying ourselves in trying to learn who they were, we should try to learn the rulings and wisdom related in the verse.

As for an explanation of the verse in Surat Al-Qasas, Allah decreed that a man would come to Musa, informing him that the chiefs in the city were consulting each other regarding what they should do about Musa, peace be upon him, who had killed one of the Copts. The man coming was a blessing from Allah Almighty to Musa, which is why the man said :
"So escape. Truly. I am to you of those who give sincere advice".

Musa was careful and left the area, and Allâh Almighty relates the rest of the story in this chapter.

In the verse of Surah Ya Sin, Allâh Almighty sent to the people of the town two Messengers, and the people rejected them and the message they came with, so Allah Almighty sent a third Messenger, supporting the other two with him. Yet the people continued to disbelieve. Later, a man came running from the farthest part of the town, and said:
"And there came a man running from the farthest part of the town. He said: "O my people! Obey the Messengers; obey those who ask no wages of you, and who are rightly guided. And why should I not worship Him Who has created me and to Whom you shall be returned."

And this was his reward:
"It was said: Enter Paradise. He said: Would that my people knew! That my Lord has forgiven me, and made me of the honored ones!"