which versue is smallest versue of Holy QUran ?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.

The shortest verse in the Quran upon which there is no controversy that it is a verse could be the Saying of Allaah (which means): {Dark green [in color].}[Quran 55:64], {مدهامتان}. However, there is a difference of opinion on some other verses like the Saying of Allaah (which means): {By time}{والعصر}[Quran 103:1], {The Most Merciful} {الرحمن}[Quran 55:1], and some other beginnings of chapters like {Alif, Lam, Meem} {ألم}, and {Ha, Meem} {حم}. Some scholars considered each of these words as a separate verse, whereas some others did not consider them as such.

Allaah Knows best.