I am wondering about the following three letters:
- چ – Che
- گ – Gaf
- پ – Pe
These three letters are not in the Qur'an (not even a single time).
Is there any reason behind that?
I assume you are from the area around Iran-Pakistan.
Why do I say this in my answer? That's because the answer to your question is simple!:
The three letters that you have presented do not exist in Arabic. Those letters exist in languages such as Persian and Urdu, which are written with an expanded version of the Arabic abjad.
I hope that answers your question.
These are Persian letters and don't exist in the Arabic language. The Qur'an is written in Arabic - it doesn't contain these letters.
Note that there are 4, not 3 : ژ (zhe) is another one.
This letters you mention are not in Arabic alphabet.
For example, according to Wikipedia:
چ – Che is an additional letter of the Persian alphabet, used to represent [t͡ʃ], and which derives from ǧīm (ج) by the addition of two dots. It is found with this value in other Arabic-derived scripts. It is used in Persian, Pashto, Kurdish, Azerbaijani, other Iranian languages and Urdu, but not in Arabic. However, it might be used in Arabic texts to represent other phonemes when writing words with sounds not in Arabic letters.
PS: to learn the Arabic alphabet see this links The Arabic Alphabet - Chart
the three letters you mention are not in Arabic language
PS : Aayah 29 of surah elfath in Quran contains all Arabic letters
Again letter Gaf is of the Sanskrit language, a fabrication to promote denial of truth by faith, such as hinduism, based on racism. Every thing desires by the heart and mind is known as Ya, such as Ya Allah, or as mentioned in Holy Quran, Allah the merciful addressed up HIS beloved messenger Nobel, Mohammad pbh, as Ya Mohammad, and ya, being the base word for the English word Yes, to commit from the heart and mind from its root word Ya. For reasons to hide truth from the humanity, sound ya was converted in to Ga, a desire and made base of the fabricated word called God, an adjective, propagated as noun to fool humanity. Gaf is part of the languages influenced by the Paganism, self center ism, denial of Truth by faith, Such as Hinduism, Buddhism, etc.
Cha , Gaf and Pa are of the Sanskrit language, a fabrication of dark ages since the time of Plato. It is in denial of truth as a fundamental of being but, based on a medium of existence called Sanity, base word for the Santa, Saint, santan etc. They are not letters but fabrication to promote immorality by faith faith with the help of fabricated sounds to fool humanity in to illegality.
Truth has no value for the followers of Pharaoh ism, but end justifies the means, as a way of life. The letter 'cha' was fabricated to be equal to the Latin, Hebrew or Arabic letter 'Sheen', Sha, meaning form, or follow, and made part of languages influenced by the Sanskrit language, such as Indo-European languages, Persian, and Hindi. As is the case with word Chamber in English or Chi, in Chinese, and the south Eastern countries, and foundation of Hinduism, Buddhism, Judaism and Christianity.