Ramayana
अप्रविष्टं च भवनं युद्धाय पुरुषर्षभ । आह्वयेथा महाबाहो ततो हन्तासि राक्षसम् ॥ 7-63-29 ॥
O bull among men, O mighty-armed one, when he has not yet entered his dwelling you should challenge him to battle; then you shall be able to slay that Rakshasa.
english translation