Ibn al-Sari reported: Mutarrif, may Allah have mercy on him, said, “Verily, when the inward state of the servant matches his public behavior, Allah says: This is my true servant.”
Source: al-Zuhd li Hannād Ibn al-Sarī 530
عن ابن السري عَنْ مُطَرِّفٍ رحمه الله قَالَ إِنَّ الْعَبْدَ إِذَا اسْتَوَتْ سَرِيرَتُهُ وَعَلَانِيَتُهُ قَالَ اللَّهُ هَذَا عَبْدِي حَقًّا
530 الزهد لهناد بن السري