´It was narrated that Bilal said:` "The Messenger of Allah commanded me (with Tathwib) in the Adhan for Fajr, and he forbade me to do so in the Adhan for 'Isha'."
Explanation & Benefits
Maulana Ataullah Sajid
The aforementioned narration has been declared weak in terms of its chain of transmission by our esteemed researcher as well as other scholars. However, the issue mentioned in this narration is authentically reported from Anas bin Malik radi Allahu anhu with a sound chain in Musannaf Ibn Abi Shaybah and Sunan al-Kubra by al-Bayhaqi. He narrates that in the call to prayer (adhan) for Fajr, after (Hayya ‘ala al-falah), it is Sunnah to say (As-salatu khayrun min an-nawm) twice. (Musannaf Ibn Abi Shaybah: 1/208 and Sunan al-Kubra by al-Bayhaqi: 1/423)
Furthermore, in this narration, what is meant by "tathweeb" is saying (As-salatu khayrun min an-nawm).
For details, see: (al-Mawsu‘ah al-Hadithiyyah, Musnad al-Imam Ahmad ibn Hanbal: 39/337, 338)
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 715