Hawzah News Agency – Hisham b. Salim narrated:

كانَ أبو عَبدِاللَّهِ عليه السلام إذا اعتَمَّ وَذَهَبَ مِنَ اللَّيلِ شَطرَهُ أخَذَ جِراباً فيهِ خُبزٌ وَلَحمٌ وَالدَّراهِمُ فَحَمَلَهُ عَلى عُنُقِهِ ثُمَّ ذَهَبَ بِهِ إلى أهلِ الحاجَةِ مِن أهلِ المَدينَةِ فَقَسَّمَهُ فيهِم وَلا يَعرِفونَهُ فَلَمّا مَضى أبو عَبدِاللَّهِ عليه السلام فَقَدوا ذلك فَعَلِموا أنَّهُ كانَ أبا عَبدِاللَّهِ عليه السلام.

'When it was dark and part of the night had passed, Abu Abdillah (AS) would take a sack of bread, meat and money, and carry it on his back to the needy of Madina. He would distribute it among them whilst they did not even recognise him. When Abu Abdillah (AS) passed away, they missed [the aid] and realized that it had in fact been Abu Abdillah.'

Source: al-Kafi, v. 4, p. 8, no. 1