Before we shed light on what Noon Saakin rules and tanween are, their definitions, and the difference between Noon Saakin and tanween, we need to make clear why to know these terms and apply them while reciting the Holy Quran.
As we know, reading the Quran well means reciting it correctly and in accordance with the tajweed rules. It was narrated from Aisha that the Messenger of Allah (PBUH) said: “The one who is proficient with the Qur’an will be with the noble and righteous scribes (the angels), and the one who reads it and stumbles over it, finding it difficult, will have two rewards.” [Ibn Majah]
Ibn Al-Jazari also said in his famous poem about the rules of Tajweed (what means): “The practical application of Tajweed is without doubt compulsory. Who does not read the Quran correctly is a sinner. The Quran was sent down to the Messenger of Allah in this form (with tajweed), which will not change for centuries. And after that, it was passed on to the next generations through reliable chains to our present-day Sheikhs and those with Ijazah) And it (tajweed) is also beautification of recitation and adornment of pronunciation and reading.”