حَدَّثَنِي مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ قُهْزَاذَ، قَالَ: سَمِعْتُ عَبْدَ اللَّهِ بْنَ عُثْمَانَ بْنِ جَبَلَةَ يَقُولُ: قُلْتُ لِعَبْدِ اللَّهِ بْنِ الْمُبَارَكِ: مَنْ هَذَا الرَّجُلُ الَّذِي رَوَيْتَ عَنْهُ حَدِيثَ عَبْدِ اللَّهِ بْنِ عَمْرٍو: «يَوْمُ الْفِطْرِ يَوْمُ الْجَوَائِزِ»؟ قَالَ: سُلَيْمَانُ بْنُ الْحَجَّاجِ، انْظُرْ مَا وَضَعْتَ فِي يَدِكَ مِنْهُ.
Translation: Muḥammad ibn ʿAbd Allāh ibn Quhzādh narrated to me: “I heard ʿAbd Allāh ibn ʿUthmān ibn Jabalah say, ‘I asked ʿAbd Allāh ibn al-Mubārak: Who is the man from whom you transmitted the report of ʿAbd Allāh ibn ʿAmr, “The day of Fiṭr is the day of rewards”? He said, “Sulaymān ibn al-Ḥajjāj. Consider what you have placed in your hands from him.”’”
The phrase appears as an attribution under critical inquiry, not as a separately established authentic Prophetic hadith. ʿAbd Allāh ibn ʿUthmān ibn Jabalah asked Ibn al-Mubārak the question; Ibn al-Mubārak answered by naming the transmitter and warning about what was received from him.