Shiva Purana
तस्मादेकाक्षरं देवमाहुरागमपारगाः ॥ वाच्यवाचकयोरैक्यं मन्यमाना मनस्विनः ॥ २५ ॥
Hence intelligent men well-versed in the Āgamas considering identity between the word and its meaning call the lord as single-syllabled.
english translation
tasmAdekAkSaraM devamAhurAgamapAragAH ॥ vAcyavAcakayoraikyaM manyamAnA manasvinaH ॥ 25 ॥
hk transliteration by Sanscript