Sayyiduna Ibn Mas'ud (may Allah be pleased with him) said: "Among the seven heavens there is one heaven in which there is not a hand-span of space but that upon it is the forehead of an angel or his two feet, standing." Then he recited: "And indeed, we are those who line up in rows, and indeed, we are those who glorify (Allah)" [Surah al-Saffat: 166].
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9010