Mishkat al-Masabih
Abu Huraira said that when the Prophet (ﷺ) once visited Bilal and saw he had a heap of dates, he asked him what it was. One his replying, “It is something I have stored up for tomorrow,” he said, “Are you not afraid that tomorrow you may see on account of it steam in the fire of jahannam on the day of resurrection? Spend it, Bilal, and do not fear poverty from the Lord of the Throne.” Baihaqi transmitted it in Shu’ab al-iman.
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ دَخَلَ عَلَى بِلَالٍ وَعِنْدَهُ صُبْرَةٌ مِنْ تَمْرٍ فَقَالَ: «مَا هَذَا يَا بِلَالُ؟» قَالَ: شَيْءٌ ادَّخَرْتُهُ لِغَدٍ. فَقَالَ: «أَمَا تَخْشَى أَنْ تَرَى لَهُ غَدًا بخارا فِي نَار جَهَنَّمَ يَوْمَ الْقِيَامَةِ أَنْفِقْ بِلَالُ وَلَا تَخْشَ من ذِي الْعَرْش إقلالا»
Reference