Sunnah.com reference : Book 8, Hadith 132English translation : Book 8, Hadith 1088Arabic reference : Book 8, Hadith 1077
al-Harith bin Abu Usamah reported from the Hadith of 'Ubadah bin as-Samit [RA) - tracing it to the Prophet (ﷺ):
"It is not permissible to play in three things: divorce, marriage and emancipation. Therefore, whoever pronounce (either of) them, they certainly become binding."

[Its chain of narrators is Da'if (weak)].
وَلِلْحَارِثِ اِبْنِ أَبِي أُسَامَةَ : مِنْ حَدِيثِ عُبَادَةَ بْنِ اَلصَّامِتِ رَفَعَهُ : { لَا يَجُوزُ اَللَّعِبُ فِي ثَلَاثٍ : اَلطَّلَاقُ , وَالنِّكَاحُ , وَالْعِتَاقُ , فَمَنْ قَالَهُنَّ فَقَدَ وَجَبْنَ }  وَسَنَدُهُ ضَعِيفٌ  1‏ .‏‏1 ‏- انظر ما قبله .‏ وفي " الأصل " تفصيل لطرق وشواهد الحديث.‏