Sunan Ibn Majah 944
سنن ابن ماجه#944SahihBusr bin Sa’eed said:“They sent me to Zaid bin Khalid to ask him about passing in front of one who is performing prayer. He told me that the Prophet (ﷺ) said: ‘Waiting for forty is better than passing in front of one who is performing prayer.’” (One of the narrators) Sufyan said: "I do not know if he meant forty years, months, days, or hours
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih Lighairihi
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih
In-book reference: 5:142