2 occurrences across the corpus

NT Apocrypha/Pseudepigrapha

Infancy Gospel of Thomas 14:1

But when Joseph saw the understanding of the child, and his age, that it was coming to the full, he thought with himself again that he should not be ignorant of letters; and he took him and delivered him to another teacher. And the teacher said unto Joseph: First will I teach him the Greek letters, and after that the Hebrew. For the teacher knew the skill of the child and was afraid of him: notwithstanding he wrote the alphabet and Jesus pondered thereon a long time and answered him not.

OT Pseudepigrapha

The Letter of Aristeas 1:15

'They need to be translated,' answered Demetrius 'for in the country of the Jews they use a peculiar alphabet (just as the Egyptians, too, have a special form of letters) and speak a peculiar dialect.