Sahih Muslim , Book 7, Hadith 3103 (USC-MSA) ⓘ
This hadith has been narrated on the authority of Qatada with the same chain of transmitters and he said: " More than three (days) except in the company of a Mahram."
وَحَدَّثَنَاهُ ابْنُ الْمُثَنَّى، حَدَّثَنَا ابْنُ أَبِي عَدِيٍّ، عَنْ سَعِيدٍ، عَنْ قَتَادَةَ، بِهَذَا الإِسْنَادِ وَقَالَ " أَكْثَرَ مِنْ ثَلاَثٍ إِلاَّ مَعَ ذِي مَحْرَمٍ " .
also referenced under: Book 15, Hadith 469 (In-Book) & Hadith 827 (Reference)