Is there anything reported regarding the recitation of Surat As-Sajdah and Al-Mulk between Maghrib and 'Isha, as well as the recitation of three verses from Surat Al-An'am immediately after Fajr prayer?

The widespread hadiths regarding the virtues of individual surahs of the Qur'an are not authentic. Some fabricators attributed false hadiths to the Prophet, peace and blessings be upon him, to motivate people to read the Qur'an. Among them were Nuh ibn Abi Maryam and Maysarah ibn Abd Rabbih. The hadiths reported concerning the virtue of reciting Surah As-Sajdah and Surah Al-Mulk between Maghrib and Isha are not established, and likewise the hadiths about the virtue of the beginning of Surah Al-An'am.

However, authentic hadiths have been reported regarding the virtue of reciting Surah As-Sajdah in the Fajr prayer on Friday, and regarding the virtue of Surah Al-Mulk, stating that it intercedes for its reciter. The Prophet, peace and blessings be upon him, used to recite it before sleeping.