عَنْ كَعْبِ بْنِ مَالِكٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: لَقَلَّمَا كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَخْرُجُ إِذَا أَرَادَ سَفْرًا إِلَّا يَوْمَ الْخَمِيسِ
It is narrated from Sayyiduna Ka'b bin Malik (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) intended to travel, he would rarely set out on any day other than Thursday.