Mark 14:13-15

14:13 He sent two of his disciples and told them, “Go into the city, and a man carrying a jar ¹  of water will meet you. Follow him. 14:14 Wherever he enters, tell the owner of the house, ‘The Teacher says, “Where is my guest room where I may eat the Passover with my disciples?”’ 14:15 He will show you a large room upstairs, furnished and ready. Make preparations for us there.”

[14:13]  ¹ sn Since women usually carried these jars, it would have been no problem for the two disciples (Luke 22:8 states that they were Peter and John) to recognize the man Jesus was referring to.