In the shia book “Rawda fi Fadhail Amir al-Muminin” (P 168, h 144) by Shazan ibn Jibril al-Qummi, you can read such report:

وبالإسناد – يرفعه – إلى المقداد قال : كنا مع رسول الله ( صلى الله عليه وآله وسلم ) وهو متعلق بأستار الكعبة وهو يقول : اللهم اعضدني واشدد أزري واشرح صدري وارفع ذكري قال : فنزل جبرئيل (ع) وقال : اقرأ يا محمد قال : وما أقرأ ؟ قال : إقرأ * (بسم الله الرحمن الرحيم × ألم نشرح لك صدرك * ووضعنا عنك وزرك * الذي أنقض ظهرك * ورفعنا لك ذكرك بعلي صهرك) * قال : فقرأها عليهم (صلى الله عليه وآله وسلم ) وأثبتها ابن مسعود وأسقطها عثمان

With chain till Miqdad: Messenger of Allah (sallalahu alaihi wa alihi wa sallam) was touching to cover of Kaaba, and he said: O my Allah make me strong, and strengthen my back, and enlarge my chest, and raise my mention.

And (upon this) descended Jibril (a) and said: Read, O Muhammad!

(He) said: And what should I read?

(Jibril) said: Read: Bismillahi Rahmani Rahim. Have We not expanded for you your breast, And taken off from you your burden, Which pressed heavily upon your back, And exalted for you your esteem BY ALI your son in law.

(He) said: And I read it upon them (sallalahu alaihi wa ala alihi wa sallam), and it was proved by ibn Masood, and DROPPED BY UTHMAN.

For the benefit of readers I am posting Surah al-Inshirah which is altered as this shia report claims!

[Shakir 94:1] Have We not expanded for you your breast,
[Shakir 94:2] And taken off from you your burden,
[Shakir 94:3] Which pressed heavily upon your back,
[Shakir 94:4] And exalted for you your esteem?
[Shakir 94:5] Surely with difficulty is ease.
[Shakir 94:6] With difficulty is surely ease.
[Shakir 94:7] So when you are free, nominate.
[Shakir 94:8] And make your Lord your exclusive object.