عَنْ أَبِي عَبْدِ اللٌّهِ )ع( أَنَّ رَسُولَ اللٌّهِ )ص( حَضَرَ شَابّاً عِنْدَ وَفَاتِهِ فَقَالَ: لَهُ قُلْ لاَ إِلَهَ إِلاَّ اللٌّهُ. قَالَ: فَاعْتُقِلَ لِسَانُهُ مِرَاراً. فَقَالَ لِإِمْرَأَةٍ عِنْدَ رَأْسِهِ: هَلْ لِهٌذَا أُمٌّ؟ قَالَتْ: نَعَمْ أَنَا أُمُّهُ. قَالَ: أَفَسَاخِطَةٌ [أَنْتِ] عَلَيْهِ؟ قَالَتْ: نَعَمْ مَا كَلَّمْتُهُ مُنْذُ سِتِّ حِجَجٍ. قَالَ لَهَا: ارْضَيْ عَنْهُ. قَالَتْ: رَضِيَ اللٌّهُ عَنْهُ بِرِضَاكَ عَنْهُ يَا رَسُولَ اللٌّهِ. فَقَالَ لَهُ رَسُولُ اللٌّهِ )ص(: قُلْ لاَ إِلَهَ إِلاَّ اللٌّهُ. قَالَ فَقَالَهَا. ثُمَّ طَفَا.
Imam as-Sadiq (peace be upon him) relates: “Once, the Messenger of Allah (peace be upon him and his family) approached a youth who was on the verge of dying, and said to him: “Say ‘There is no God except Allah.’ But the youth’s tongue appeared to be tied and he was unable utter the words. When this took place several times, the Prophet said to a lady standing near the youth’s head: “Does this youth have a mother?” The lady replied: “Yes, I am his mother.” The Prophet asked her: “Are you angry with him?” She confessed: “Yes. I have not spoken to him for the last six years.” Hearing this, he said to her: “Be pleased with him.” She agreed and said: “O’ Prophet of Allah! For the sake of your pleasure, may Allah be pleased with him.” (Then, turning to the youth) he said: “Say ‘There is no God, except Allah’). (This time) the youth was able to recite the words and shortly afterwards, his soul departed his body.”
Biharul Anwar, Volume 74, Page 75