Yahya ibn Sa'd explained

Yahya ibn Sa'd (Arabic: يحيى بن سعد) is one of the more prominent Tabi'een.^[1]

He has narrated the Hadith of the door to knowledge.^[2]

References

Notes and References

1. http://www.usc.edu/dept/MSA/law/alalwani_usulalfiqh/ch3.html USC-MSA Compendium of Muslim Texts
2. http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/scienceofhadith/aape.html#G14 USC-MSA Compendium of Muslim Texts