Source: The Great Interpretation of Dreams (Ibn Sirin)
Thread in a dream indicates proof and evidence. White thread is dawn, and black thread is night. Tying a thread indicates completing a matter or magic.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Thread indicates intimacy and connection. Thread in a needle indicates little sustenance.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Thread is interpreted as sustenance. Whoever sees himself spinning it will gain sustenance.