This recording by Guruji was done in 1985. He recommended reciting this śloka in the morning before chanting the Guru Pāduka mantra.

ॐ गुरुर् ब्रह्मा गुरुर् विष्णुः 
गुरुर् देवो महेश्वरः
गुरु साक्षात् परब्रह्मा

तस्मै श्री गुरवे नमः

oṁ gurur brahmā gurur viṣṇuḥ 
gurur devo maheśvaraḥ
guru sākṣāt parabrahmā

tasmai śrī gurave namaḥ

Guru is Brahmā (the Creator)

Guru is Viṣṇu (the Sustainer)

Guru is Śiva (the Lord of Dissolution)

Truly, Guru is the Transcendent One
To that most venerable Guru, we pay homage.