Surah Taha 20:23

لِنُرِيَكَ مِنْ ءَايَـٰتِنَا ٱلْكُبْرَى

That We may show you [some] of Our greater signs.

Translation: Saheeh International

Tafsir

That We may show you thereby when you do this as described above in order to manifest it of Our greatest signs the sign that is the greatest proof of the truth of your Mission from God and should he want it to be restored to its former state he would thrust it into his armpit as has been mentioned and then bring it …

Excerpt from Tafsir al-Jalalayn, commentary on 20:23, via Quran.com. The reader has the full commentary and 9 more tafsirs.