Lord Śiva’s lotus feet were worshiped by both the demigods and demons, but still, in spite of his exalted position, as soon as he saw that Lord Brahmā was there among all the other demigods, he immediately stood up and offered him respect by bowing down and touching his lotus feet, just as Vāmanadeva offered His respectful obeisances to Kaśyapa Muni.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
स तूपलभ्यागतमात्मयोनिं सुरासुरेशैरभिवन्दिताङ्घ्रिः । उत्थाय चक्रे शिरसाभिवन्दन- मर्हत्तमः कस्य यथैव विष्णुः
sa tūpalabhyāgatamātmayoniṃ surāsureśairabhivanditāṅghriḥ | utthāya cakre śirasābhivandana- marhattamaḥ kasya yathaiva viṣṇuḥ
SB 4.6.40