It is narrated from Abu Burdah (may Allah have mercy on him) that when Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) reached al-Hirah, he said: "Bring me poison." So poison was brought, and he placed it in his palm, then said: "Bismillah (In the name of Allah)," and swallowed it, and it did him no harm.
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3793