Ahad vs Wahidواحد vs أحد: The Arabic Word That Proves God's Absolute Oneness in Surah Al-Ikhlas**

The word “واحد” is the name of the beginning of the number, so it is said: واحد, two, and three. As for “احد,” the number is interrupted with it, so it is not said: احد, two, three.

The word “احد” in negation is more general than “واحد” so it is said: “There is no واحد in the house,” and it is permissible for there to be two, three, or more. However, if he said: “There is no احد in the house,” then it is a complete negation of the existence of the genus, so there is no احد , two, three, more, or less in it.

The word “واحد” can be used as a description of anything I want, so it is correct to say: “واحد man,” and “واحد garment,” but it is not correct to describe something in the affirmative aspect with “احد” except God, the احد: “Say, ‘He is God, the احد.’” [Al-Ikhlas: 1] So it is not said: “احد man,” nor “احد garment,” as if God Almighty has reserved this description for Himself.

قُلْ هُوَ ٱللّٰهُ أَحَدٌ

It is derived from the root word و ح د (w-ḥ-d) of وَاحِد (wāḥid, “one”)

now based on its root word it can mean “unity” only if it was أَحَّدَ (ʔaḥḥada, “unite, unify”)

since the word ” أَحَد • (ʔaḥad) ” is used here, it only means “one” not unity

1. one

Say, ˹O Prophet,˺ “He is Allah—One ˹and Indivisible˺; Allah—the Sustainer ˹needed by all˺. He has never had offspring, nor was He born. And there is none comparable to Him.