The Quraysh's final plot fails
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When the Quraysh saw that the Messenger of Allah had Companions and helpers in Madinah over whom they had no power, they were alarmed about his departure. They knew that if that happened, they would have no means to stop him. So they assembled in the Dar an-Nadwah, the house of Qusayy ibn Kilab which the Quraysh used when decision-making, The Quraysh nobles consulted one another on what to do about the Messenger of Allah.
They finally agreed that each tribe would provide a young warrior and together they would attack the Messenger of Allah, each man striking a blow. That way responsibility for his death would be divided among the tribes and the Banu Abd Manaf would not be able to fight them all.
Allah informed His Messenger of this plot, so he could tell Ali ibn Abi Talib to sleep in his bed wrapped up in his cloak, adding, 'Nothing unpleasant will happen to you.
When the murderous gang gathered at the door intending to attack, the Messenger
of Allah came out and took up a handful of dust. Allah then instantly removed
their sight and the Messenger of Allah scattered the dust over their heads while
reciting verses from Surah Yaseen, 'We have covered them so that they do not see,' (36: 9) Someone came to them and said, 'What are you waiting here for'
'Muhammad,' they replied.
'May Allah disappoint you!' he said. 'By Allah, he came out earlier and went about his business.'
When they looked and saw someone sleeping on the bed they did not doubt that it was the Messenger of Allah. But in the morning when Ali got up from the bed, they were so embarrassed that they slunk away quietly.