Ibn Mas'ud said regarding God's words, "He was two bows' length away or nearer," "The heart did not belie what it saw," and "He has indeed seen the greatest of the signs of his Lord," that they all refer to his seeing Gabriel who had six hundred wings.
(Bukhari and Muslim.)
In Tirmidhi's version he said regarding "The eye did not belie what it saw" that God's messenger saw Gabriel in a mantle of thin brocade, filling the space between the sky and the earth.
Tirmidhi and Bukhari tell regarding His words, "He has indeed seen the greatest of the signs of his Lord," that he saw thin green brocade which blocked out the horizon in the sky.