Valmiki Ramayana Kishkindha Kanda Sarga 5 Shloka 12

वा if , सख्यम् friendship, रोचते यदि is desired, एषः this is, बाहुः my arm, प्रसारितः stretched, पाणिना on my hand, पाणिः your hand, गृह्यताम् may be received, ध्रुवा firm, मर्यादा with due2 2regard, बध्यताम् may be bound

'If you are desirous of my friendship, here is my arm (palm) stretched out to you. With due regard, establish our bond firmly, holding my palm in yours.'