“Indeed, I have seen revelation descend upon him on a day of biting cold; when it withdrew from him, his brow would be streaming with sweat.”

As for the word faṣm (with a ṣād), it means to part or separate something supple or pliant, as in the verse:
“Whoever rejects the false deity and believes in Allah has grasped the most trustworthy handhold, one that will never break; and Allah is All-Hearing, All-Knowing.” ⦗2:256⦘

With a qāf—qaṣm—it denotes the breaking of something solid and hard.

Thus the report makes clear that when the angel brings down the revelation, he becomes joined to the Prophet and interwoven with him; afterwards he disengages and separates from him. Because this encompassing union and subsequent separation are so pronounced, it is fitting that one of the two—Gabriel and Muhammad—be substituted for the other in expression.

Accordingly one may say: “This Quran was conveyed by the human Messenger, and it was conveyed by Gabriel on behalf of Allah.” Similar instances abound in all of the Messiah’s glad tidings.

It is reported that “the Father,” in their language, means Allah—the One who sends the Paraclete. In some versions he said, “I shall ask the Father …”