In جَاءَ, an alif madd is followed by hamzah in the same word: this is madd muttaṣil.
Compare al-Kāfirūn’s لَا أَعْبُدُ: its madd and hamzah are in separate words, so that is madd munfaṣil.
Lengthen according to the recitation path you have learned and avoid arbitrary changes.
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Jāʾa: why this is madd muttaṣil
Al-Kāfirūn and An-Naṣr: Applied Madd, Idghām, Ghunnah and Waqf
In جَاءَ, an alif madd is followed by hamzah in the same word: this is madd muttaṣil.
Compare al-Kāfirūn’s لَا أَعْبُدُ: its madd and hamzah are in separate words, so that is madd munfaṣil.
Lengthen according to the recitation path you have learned and avoid arbitrary changes.