Tel Zayit Inscription, 10th century BCE

On July 15, 2005, on the final day of that season’s excavations at Tel Zayit, archaeologists unearthed a limestone boulder embedded in a wall. The letters of the Hebrew alphabet were inscribed on it in their traditional order. The stone was part of a wall dated to the 10th century BCE, leading to the conclusion that this is the earliest known specimen of the Hebrew alphabet.

See also-

• New York Times- A Is for Ancient, Describing an Alphabet Found Near Jerusalem