Sayyiduna Basr bin Sa'id (may Allah be pleased with him) says that once Abu Juhaym, the nephew of Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him), sent me to Sayyiduna Zayd bin Khalid (may Allah be pleased with him) to ask him about the hadith which he had heard regarding a person passing in front of someone who is praying. He said: I heard the Prophet (peace and blessings of Allah be upon him) say: For a person, it is better to stand and wait for forty . . . . . than to pass in front of someone who is praying. I do not remember whether the Prophet (peace and blessings of Allah be upon him) said days, months, or years.