Why did Allah Almighty specify the number "ten" in matters such as: the last ten days of Ramadan, the first ten days of Dhul-Hijjah, and a good deed being rewarded tenfold?

Allah Almighty is "the Wise" in His sayings, actions, creation, and management. A certain number may be repeated in the Qur'an and Sunnah for a wisdom known to Allah. It is not permissible to definitively state the wisdom behind this repetition except with a legal text, and the ijtihad (independent reasoning) of scholars in this regard is merely an attempt to seek understanding, with the necessity of being cautious against artificiality and speaking about Allah without knowledge. The exegetes did not mention a specific wisdom for the number ten, but Ibn al-Qayyim spoke about the characteristics of the number seven.