Ramayana
कुशमुष्टिमुपादाय लवं चैव तु स द्विजः । वाल्मीकिः प्रददौ ताभ्यां रक्षां भूतविनाशिनीम् ॥ 7-66-6 ॥
That twice-born Valmiki, taking up a handful of kusha grass and a lava (a single blade of it), bestowed upon the two of them a protection that destroys evil spirits.
english translation