The Shia and Sunnis alike relate from Ali—may Allah be pleased with him—that when he passed by Karbala, he said:
“Remain steadfast, O Abū Abd Allāh! Remain steadfast, O Abū Abd Allāh!”
He was addressing al-Husayn because he knew that al-Husayn would be killed. This was before al-Husayn had arrived at Karbala and efforts were made to kill him.
The Prophet—may Allah bless him and grant him peace—spoke of the Dajjal and his emergence, saying:
“O servants of Allah, stand firm!” (1)
Yet those servants of Allah had not yet come into existence.
The Muslims say in their prayers:
“Peace be upon you, O Prophet, and the mercy of Allah and His blessings.”
He is not present with them, but he is present in their hearts.
Allah Most High says:
“His command, when He wills something, is only to say to it, ‘Be!’ and it is.”
[Surah Yā Sīn: 82]
According to most scholars, this is an address directed (2) to something the Lord Most High knows within Himself, even though it does not yet exist. Whoever says that it is an expression for the manner of bringing things into being has contradicted the plain import of the address. Construing the verse in this way would require that such language of address actually be used with this meaning and that this usage belong to the language in which the Quran was revealed. Otherwise, no one may construe the discourse of Allah and His Messenger according to whatever notion happens to occur to him.