Its occasion has been mentioned in numerous places in the books of the exoteric scholars (ahl al-zahir), and it was the most beloved of titles to our Master, the Commander of the Faithful, as mentioned in one of the narrations.
"Dust" (turab) is an allusion to the believer, meaning that our Master (exalted be his might) is a God and a Father to the believers; and the Father in the Gospel is the First Hypostasis (al-uqnum al-awwal) (Allah).
❖ From Surah An-Nazi'at ❖
The Verse: [“And after that He spread the earth.”] 1
It was stated in several sermons of our Master (exalted be his might), mentioned in Al-Kawkab al-Durri, Mashariq al-Anwar, and others, wherein he explicitly said: "I spread its earth."
❖ From Surah Al-Mutaffifin ❖
The Verse: [“No! Indeed, from their Lord, that Day, they will be partitioned [veiled].] 2
It was recorded in Mashariq al-Anwar from the Messenger (exalted be his might) that he said: "For the Imam is with all of creation; he is not absent from them, and they cannot be hidden [veiled] from him. Rather, they are veiled from [seeing] him, while he is not veiled, etc."