لَوْ كُنْتُ مُتَّخِذًا خَلِيلًا لَاتَّخَذْتُ أَبَا بَكْرٍ خَلِيلًا وَلَكِنَّهُ أَخِي وَصَاحِبِي
Were I to take a khalil, I would take Abu Bakr as my khalil; rather, he is my brother and companion. (Sahih Muslim, Virtues of Abu Bakr)
This report honors Abu Bakr’s special closeness while distinguishing the relationship of khalil from that of a dear brother and companion.