瑜伽師地論略纂 2.105

2.105

清淨具中，「吉祥草」者，婆羅門法，欲行等時，或目見人持，或有人遺道吉祥草者，定是吉祥之相故。　「頻䗍菓」者，頻婆菓也，此吉祥果。「螺貝」者，吉祥貝，或貝即螺，或螺貝別。　「滿瓫」者，瓫盛滿物，吉祥相也。西方見此，或有人與，桴為吉祥，咸生喜樂，名清淨貝。

Among the articles of purification, regarding 'kuśa grass': according to the customs of the brahmins, when they wish to set out on a journey and the like, if they see someone carrying it or someone leaves kuśa grass on the road, it is definitely an auspicious sign. As for 'bimba fruit': it is the bimba fruit, which is an auspicious fruit. As for 'conch shell': it is an auspicious conch; or the shell is just the conch, or conch and shell are different. As for the 'full vase': a vase filled with goods is an auspicious sign. In the Western regions, when people see this or someone gives it to them, they take it as auspicious and all give rise to joy; hence they are called pure conches [and treasures].