Aisha reported: After the Prophet, peace and blessings be upon him, was miraculously taken by night to the furthest mosque in Jerusalem, the people began to talk about it. Some of them renounced their faith and belief in him. They sought Abu Bakr and they said, “Have you heard that your friend imagined he was taken by night to the sacred house?” Abu Bakr said, “Did he say that?” They said yes. Abu Bakr said, “If he said it, he has spoken the truth.” They said, “Do you believe he went by night to the sacred house and returned before morning?” Abu Bakr said, “Yes. Verily, I believe what is even more astonishing than that. I believe he has received messages from heaven for everything he does.” For this reason, Abu Bakr was named the Truthful, al-Siddiq.
Source: Dalā’il al-Nubuwwah lil-Bayhaqī 2/361
Grade: Sahih (authentic) according to Al-Albani
عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ لَمَّا أُسْرِيَ بِالنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِلَى الْمَسْجِدِ الأَقْصَى أَصْبَحَ يَتَحَدَّثُ النَّاسُ بِذَلِكَ فَارْتَدَّ نَاسٌ مِمَّنْ كَانُوا آمَنُوا بِهِ وَصَدَّقُوهُ وَسَعَوْا بِذَلِكَ إِلَى أَبِي بَكْرٍ رَضِيَ اللَّهُ عَنْهُ فَقَالُوا هَلْ لَكَ فِي صَاحِبِكَ يَزْعُمُ أَنَّهُ أُسْرِيَ بِهِ فِي اللَّيْلِ إِلَى بَيْتِ الْمَقْدِسِ قَالَ أَوَ قَالَ ذَلِكَ قَالُوا نَعَمْ قَالَ لَئِنْ كَانَ قَالَ ذَلِكَ لَقَدْ صَدَقَ قَالُوا وَتُصَدِّقُهُ أَنَّهُ ذَهَبَ اللَّيْلَةَ إِلَى بَيْتِ الْمَقْدِسِ وَجَاءَ قَبْلَ أَنْ يُصْبِحَ قَالَ نَعَمْ إِنِّي لأُصَدِّقُهُ بِمَا هُوَ أَبْعَدُ مِنْ ذَلِكَ أُصَدِّقُهُ بِخَبَرِ السَّمَاءِ فِي غُدْوَةٍ أَوْ رَوْحَةٍ فَلِذَلِكَ سُمِّيَ أَبُو بَكْرٍ الصِّدِّيقَ
2/361 دلائل النبوة للبيهقي المدخل إلى دلائل النبوة ومعرفة
306 المحدث الألباني خلاصة حكم المحدث متواتر في السلسلة الصحيحة