(Ramkali M. 3, p. 909) The three gods Brahma, Vishnu and Shiva represent the modes of Rajas, Sattva and Tamas respecdvely. These three modes together constitute maya, hence they cannot see God, their Creator. Guru Nanak Dev says in Japuji: “The Maya became conceived (by the Lord) and the three approved disciples manifested. The one was the creator, the other preserver (distributor) and the third one held court. They work according to the Will of the Lord and are Commanded by him. They look towards Him, but they cannot behold him; this is highly wonderful.”
References :
1. Kohli, Surindar Singh ed, Dictionary of Mythological References in Guru Granth Sahib, 1993