Ezra 2:41 Kabbalah

הַֽמְשֹׁרְרִ֑ים בְּנֵ֣י אָסָ֔ף מֵאָ֖ה עֶשְׂרִ֥ים וּשְׁמֹנָֽה׃ (פ)

The singers: the children of Asaph, a hundred twenty and eight.

Read kabbalistic (mystical) interpretation of Ezra 2:41: and classical mystical sources.