Valmiki Ramayana Yuddha Kanda Sarga 72 Shloka 12

यत्रयत्र where ever, गुल्मः troops, भवेत् are posted, तत्रतत्र here and there, पुनःपुनः again and again, सर्वदैव all over, निष्क्रामोवा be it exit, प्रवेशोवा be it entry, सः that, ज्ञातव्यः not to go out.

"Wherever the troops are posted here and there be it exit, or entrance should be checked again and again and not to go out."