Seeing a bell in your dream generally signifies a signal or warning. If you are holding a bell, it may indicate that a conflict or turbulent situation is approaching in your life. Additionally, seeing a bell can suggest that you or someone around you is bringing important news or announcements. It can also symbolize changes in your life or new directions ahead.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Bell" (page 37).
Possessing small bells in a dream means a fight, an argument or vain talk known of the person holding them. Seeing a bell in a dream represents the announcer or the forerunner of aruler. Generally speaking seeing a bell in a dream means that someone will bring glad tidings. If the bell is roped around the neck of an animal in the dream, it means travel. The bells of a church represent people one can seek their advice and follow their opinion. Bells in a dream also represent calling to prayers or preparing to meet one's enemies, or they could mean the arrival of a caravan or a shipment. Bells in a dream also represent abrogated books of revelations or tampering with God's revelations or they could represent past traditions. (Also see Hand bell)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.