Wikipedia
Maudgalyāyana (; ; , Mokuren or Mokkenren ; Sinhala: මහා මොග්ගල්ලාන මහ රහතන් වහන්සේ ), also known as Mahāmaudgalyāyana or Mahāmoggallāna, was one of the Śākyamuni Buddha's closest disciples. A contemporary of famous arhats such as Subhūti, Śāriputra, and Mahākāśyapa, he is considered the second of the Buddha's two foremost disciples (foremost in supernatural powers), together with Śāriputra. He was born in a Brahmin family of Kolita.
Varying accounts in the Pali Canon show Maudgalyāyana speaking with the deceased in order to explain to them their horrific conditions and give them an understanding of their own suffering, so that they may be released from it or come to terms with it. Maudgalyāyana was able to use his powers of mind-reading in order to give good and fitting advice to his students, so they could attain results quickly.