Is there a sound Hadith that describes the Prophet, peace and blessings be upon him, as "the laughing slayer"?

The Prophet's, peace and blessings be upon him, laughter was mostly a smile. Allah described him as merciful, which almost caused him to perish himself out of grief over people's disbelief, as stated in His Almighty words: "So let not your soul go out in regret over them" and "Then perhaps you, [O Muhammad], will afflict yourself to death because they do not believe in this message, [and] out of sorrow." As for his description as "the laughing killer," it means that he smiles in the faces of believers, and his laughter and good character do not prevent him from upholding the limits of Allah, and he is a killer of the enemies of Allah.