It is narrated from Khaythamah (may Allah have mercy on him), from someone who heard Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) said: "Worldly conversation after the Isha prayer is not permissible, except that the one who prays and the traveller may talk about what they need."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2127