There is no believing servant who supplicates for his brother behind his back (in his absence) that the Angels do not say: The same be for you too. (Using translation from Muslim 2732a)
قَالَ رَسُولُ اللَّهِ ﷺ «مَا مِنْ مُسْلِمٍ يَدْعُو لِأَخِيهِ بِظَهْرِ الْغَيْبِ إِلَّا قَالَ الْمَلَكُ وَلَكَ بِمِثْلٍ وَلَكَ بِمِثْلٍ»
the Messenger of Allah ﷺ said, “There is no believing servant who supplicates for his brother behind his back except that the Angels say: May the same be for you.”
قَالَ رَسُولُ اللَّهِ ﷺ «مَا مِنْ عَبْدٍ مُسْلِمٍ يَدْعُو لأَخِيهِ بِظَهْرِ الْغَيْبِ إِلاَّ قَالَ الْمَلَكُ وَلَكَ بِمِثْلٍ.»
that he heard the Messenger of Allah ﷺ say, “He who supplicates for his brother behind his back (in his absence), the representative Angel [assigned] to him says: Amen, and it is for you also.”
أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ: «مَنْ دَعَا لأَخِيهِ بِظَهْرِ الْغَيْبِ، قَالَ الْمَلَكُ الْمُوَكَّلُ بِهِ: آمِينَ وَلَكَ بِمِثْلٍ.»
[Machine] I heard the Messenger of Allah ﷺ saying, "Verily, the supplication of a person is answered as long as he does not call for something sinful or for cutting off the ties of kinship, and he does not rush."
سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ إِنَّهُ يُسْتَجَابُ لِلْمَرْءِ بِظَهْرِ الْغَيْبِ لِأَخِيهِ فَمَا دَعَا لِأَخِيهِ بِدَعْوَةٍ إِلَّا قَالَ الْمَلَكُ وَلَكَ بِمِثْلٍ
"مَنْ دَعَا لأَخِيه بظَهْر الْغَيب، قَال الْمَلَكُ الْمُوَكَّلُ بِهِ: آمين وَلَكَ بِمِثْلٍ".
"مَا مِنْ عَبْد مُسْلِمٍ يدْعُو لأَخِيهِ بِظَهْرِ الْغَيبِ إِلا قال الْملَكُ: وَلكَ بمِثْلٍ.
"مَا مِنْ مُسْلِمٍ يَدْعُو لأَخِيهِ بدَعْوةٍ بِظَهْرِ الْغَيبِ: اللَّهُمَّ أَخِى فُلانٌ فَاغْفِرْ لَهُ، إلا قَالتِ الْمَلائِكَةُ: آمِين وَلَكَ بِمِثْلٍ".