alkafi-3260Vol. 2, p. 517
قَالَ جَبْرَئِيلُ ع لِرَسُولِ اللَّهِ ص طُوبَى لِمَنْ قَالَ مِنْ أُمَّتِكَ- لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ وَحْدَهُ وَحْدَهُ[2].
“Jibril once said to the Messenger of Allah, ‘ Tuba (a tree in paradise) is for those among your followers who (sincerely) say: ‘No one deserves to be worshipped except Allah, Allah alone, Allah alone, Allah alone.’”