Valmiki Ramayana Sundara Kanda Sarga 48 Shloka 36

ततः then, वीरः hero, अस्त्रविदाम् among masters of weapons, वरः excellent, सुमहातेजाः glorious, सः he, तं him, हरिप्रवरं प्रति towards foremost of monkeys, पैतामहम् Grandfather Brahma's, अस्त्रम् weapon, संदधे directed

Then the heroic master of weapons, an excellent and glorious warrior directed the Brahmastram towards the foremost of monkeys.