Brihadaranyaka Upanishad With commentary of Sri Sankaracharya

The Brihadaranyaka Upanishad is one of the oldest Upanishads and one of the largest and important ones. It was written by Ajnavalkya in the mid-first millennium BCE. Brhadaranyaka Upanishad means the “great forest-book” – meaning that is should be read in solitude – and it consists of three part called kandas: the Madhu kanda, the Yajnavalkya or the Muni kanda and the Khila kanda. The text present various methods of meditation and a number of rites and rituals. Brhadaranyaka Upanishad concludes by describing the three virtues that one should practice: self-restraint, giving, and compassion. This is a huge PDF-file (989 pages, 56 MB), please keep that in mind when downloading:

Brihadaranyaka Upanishad

Update. We now have a smaller version on the book here: Link