Matsyapurana 175.37

175.37

brahyacaryādbrāhmaṇasya brāhmaṇatvaṃ vidhīyate
evamāhuḥ pare loke brahmacaryavido janāḥ //

A true Brāhmana becomes as such only by virtue of Brahmacharya and others knowing what Brahmacharya is also say that fortitude is established in Brahmacharya And asceticism is also established in the practice of Brahmacharya The Brahmana fixed in his austerities is really enshrined in heaven There is no Siddhi without Yoga and there is no fruit without Siddhi There is no higher name and fame than Brahmacharya which is the root of all—37 39