Tajweed RulesThe ra is pronounced heavy (mufakhkham) when it has fathah or dammah, or when it is sakin following a fathah or dammah. It is pronounced light (muraqqaq) when it has kasrah, or when it is sakin following an original kasrah that is not followed by a letter of isti'la (elevation).
تفخيم: رَبِّ، الْقُرْآنَ — ترقيق: رِجَالٌ، فِرْعَوْنَSource:تحفة الأطفال

