The Prophet ﷺ used to single out certain days with particular acts of worship or good deeds. In this hadeeth, Ka‘b ibn Maalik (may Allah be pleased with him)narrated that the Prophetﷺ used to prefer to travel on Thursdays, and that he ﷺ set out on Thursday for the Battle of Tabook in 9 A.H. to fight against the Romans. Tabook was a town in the far north of the Arabian Peninsula, in the middle of the road to Damascus, about 700 km away from Al-Madeenah. The Battle of Tabook was the last battle in which the Prophet ﷺ personally partook against the Romans. He ﷺ habitually set out on his journeys for travel or Jihaad purposes (i.e., conquests) on Thursdays, except for a few occasions. It was authentically reported that the Prophet ﷺtravelled on Saturday, and perhaps this was one of the examples of the few occasions mentioned by Ka‘b ibn Maalik (may Allah be pleased with him) in the other version of the hadeeth recorded by Al-Bukhaaree when he (may Allah be pleased with him) said: “It was rarely that the Messenger of Allah ﷺ set out on a journey on any day other than Thursday.” The point is that he ﷺ used to set out on Thursday for most of his travels and conquests, and the wisdom behind that is known only to Allah, Exalted is He. It was said that he ﷺ hated to travel on Fridays, and therefore used to set out on the day before (Thursday) or the day after it (Saturday). It was also said that Thursday is a blessed day during which people’s deeds are presented to Allah, Exalted is He, and he ﷺ only set out on his journeys or battles for the sake of Allah, Exalted is He, and therefore he ﷺ wanted to perform such good deeds on that blessed day in particular. It is also possible that he ﷺ believed it was a good omen to embark on his journeys and battles on Thursdays in particular, for the Arabic word Khamees (i.e., Thursday) means ‘army,’ which consists of five divisions: front, rear, left, right, and center. He ﷺ might have believed that going out for conquests on Thursday would be a good omen that Allah, Exalted is He, would protect him and bless him with the support of his soldiers (army). He ﷺ may have also found it a good omen to set out on his conquests on Thursday, hoping that he ﷺ would defeat the enemy’s army, denoted by the very Arabic word for Thursday, Khamees, and because he ﷺ would avail himself of the fifth of the gained spoils of war (i.e., the Arabic word for ‘five’ is Khamsah, derived from the same root as Khamees)..