Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The bat in a dream indicates a devout, diligent worshiper who is isolated from people. It may also indicate a sorceress. Seeing it indicates security from fear.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The bat indicates the loss of religion and the ruin of a place. It may also indicate a woman of bad character. Whoever catches one will triumph over a misguided man.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The bat is interpreted as a misguided, heretical man. Seeing it indicates unemployment and worry. Whoever sees many bats in a place, ruin will befall it.