Ruling on Lengthening Movements in Prayer

Question

Is it permissible to lengthen movements and convert them into letters, such as turning a kasrah into a yaa?

Answer 1

Peace be upon you and God's mercy and blessings.

Grand Ayatollah Sayyid Khamenei (may God protect him):

This is not permissible if it is considered adding a letter to the word. The correctness of the recitation depends on observing the movements and pauses of the letters and articulating them from their proper points of articulation in a manner that is recognized by the Arabic language experts as producing that letter and not another.

Source: Message on Prayer and Fasting - Prayer - Obligations of Prayer - Recitation - M202

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Grand Ayatollah Sayyid Sistani (may God protect him):

This is not permissible if it is considered adding a letter to the word, as correct recitation requires performing the letters and articulating them from their proper points of articulation as necessary in the Arabic language. The structure of the word must also conform to the Arabic style, including the movements of the structure and its pauses, as well as the movements of inflection and construction and their pauses.

Source: Minhaj al-Salihin - Vol 1 - Recitation, M 606

May you be successful in all good.