Sahih Muslim Book 4, Hadith Number 1767.

Chapter : Excellence of sura Fatiha and concluding verses of surat al-Baqara and exhortation to recite the last two verses of surat al-Baqara.

This Hadith has been transmitted by Qatada with the same chain of transmitters. But Shu’ba (one of the narrators) said: At the end of Surah Al-Kahf, but Hammam said: At the beginning of Surah Al-Kahf.