Mbh 13.142.6b

The rewards of one who sits and lies down upon the bare ground (with the welkin alone for his shelter) are said to be excellent vehicles and beds, and costly mansions possessed of the resplendence of the moon, O lady! That man who, having subsisted upon abstemious diet and observed diverse excellent vows, lives depending upon his own self and then casts off his body by abstaining from all food, succeeds in ascending to heaven and enjoying all its felicity. That man who, having lived in entire dependence upon his own self, observes for two and ten years the duties that appertain to Diksha, and at last casts off his body on the great ocean, succeeds in attaining to the regions of Varuna after death. That man who, living in entire dependence upon his own self observes the duties that attach to Diksha for two and ten years, and pierces his own feet with a sharp stone, attains to the felicity of the region that belongs to the Guhyakas. He who cultivates self with the aid of self, who frees himself from the influence of all pairs of opposites (such as heat and cold, joy and sorrow, etc), who is freed from every kind of attachment, and who mentally observes for two and ten years such a course of conduct after Diksha, attains to Heaven and enjoys every happiness with the deities as his companions. He who lives in entire dependence upon his own self and observes for two and ten years the duties that attach to Diksha and finally casts off his body on the fire as an oblation to the deities, attains to the regions of Brahman and is held in high respect there.