«أمنوا إذا قرئ {غَيْرِ الْمَغْضُوبِ عَلَيْهِمْ وَلا الضَّالِّينَ} »
The Prophet (peace and blessings be upon him) said:
"When (this verse of the Qur'an) 'not of those who have earned (Your) anger, nor of those who go astray' is recited, say Amin." [Surah al-Fatihah: 7]
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 1401