SB 6.8.21
devo ’parahne madhu-hogradhanva
sayam tri-dhamavatu madhavo mam
dose hrsikesa utardha-ratre
nisitha eko ’vatu padmanabhah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
May Lord Madhusudana, who carries a bow very fearful for the demons, protect me during the fifth part of the day. In the evening, may Lord Madhava, appearing as Brahma, Visnu and Mahesvara, protect me, and in the beginning of night may Lord Hrsikesa protect me. At the dead of night [in the second and third parts of night] may Lord Padmanabha alone protect me.