Valmiki Ramayana Yuddha Kanda Sarga 85 Shloka 12
Original Shlokaतेनवीरेणतपसावरदानात्स्वयम्भुवः । अस्त्रंब्रह्मशिरःप्राप्तंकामगाश्चतुरङ्गमाः ।।6.85.12।।
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वीरेण being hero, तेन by him, तपसा by austerity, स्वयम्भुवः creator, वरदानात् boon received, ब्रह्मशिरः Brahmasira weapon, अस्त्रम् arrow, प्राप्तम् attained, कामगाः coursing at his will, तुरङ्गमाः horses
"Lakshmana, being heroic received Brahmasira weapon from the creator by austerity and also horses which can course according to his will."