Guru Strotram Mantra 1 Easy Sanskrit & IAST form
गुरुब्रह्मा गुरुविष्णुः गुरुर्देवो महेश्वरः,
गुरुः साक्षात् परब्रह्म तस्मै श्रीगुरवे नमः तस्मै श्रीगुरवे नमः तस्मै श्रीगुरवे नमः
gurur brahmā gurur viṣṇuḥ gurur devo maheśvaraḥ guruḥ sākṣāt para brahma tasmai śrī gurave namaḥ tasmai śrī gurave namaḥ tasmai śrī gurave namaḥ
Meaning:
Our teacher is Brahma, Our teacher is Vishnu, Our teacher isn't only Shiva but all the Gods, the teacher is the Supreme Power to whom we all Pray.
(scroll down to listen the audio at the left for reference)