Shiva Purana
एतस्मिन्नन्तरे दैवाद्गौतमस्तत्र चागतः ॥ स दयालुस्तृणस्तंम्बैर्वारयामास तां तदा ॥ ३१॥
In the meantime Gautama happened to come there casually. Compassionate by nature, he warded off the cow with a bunch of grass blades.
english translation
etasminnantare daivAdgautamastatra cAgataH ॥ sa dayAlustRNastaMmbairvArayAmAsa tAM tadA ॥ 31॥
hk transliteration by Sanscript