1 Enoch 72:16

ወሶበ፡ ተፈጸመ፡ ሠላሳ፡ ጽባሕ፡ ተሐጽጽ፡ መዓልት፡ ወትከውን፡ አሐደ፡ ክፍለ፡ ጥንቁቀ፡ ወትከውን፡ ዕለት፡ ዐሠርተ፡ ወአሐደ፡ ክፍለ፡ ወሌሊት፡ ሰብዐተ፡ ክፍለ።

And when thirty mornings are accomplished, the day decreases by exactly one part, and becomes eleven parts, and the night seven.