My servant keeps drawing near to Me through voluntary deeds until I love him. When I love him, I become the ear with which he hears, the eye with which he sees, the hand with which he grasps, the foot with which he walks.
وما يزال عبدي يتقرب إلي بالنوافل حتى أحبه، فإذا أحببته كنت سمعه الذي يسمع به، وبصره الذي يبصر به، ويده التي يبطش بها، ورجله التي يمشي بها
Wa mā yazālu ʿabdī yataqarrabu ilayya bi'n-nawāfili ḥattā uḥibbah; fa-idhā aḥbabtuhū kuntu samʿahu'lladhī yasmaʿu bih, wa baṣarahu'lladhī yubṣiru bih, wa yadahu'llatī yabṭishu bihā, wa rijlahu'llatī yamshī bihā.
Hadith Qudsi — Bukhari, Riqaq, no. 6502 (from Abu Hurayra).
The hadith qudsi opens with a warning: “Whoever shows enmity to a friend of Mine, I declare war on him.” Then it lists the path of nearness; first come the obligatory deeds, then the voluntary ones.
Most accounts of fana lean on this narration, because here the servant is not erased: his ear, his eye, his hand, his foot remain in place.
What changes is who it is that hears and sees through them.
In the authentic source, the description of union begins with love and becomes visible in the body.