Completing Leadership in Prayer
Scholars have said that whoever sees themselves completing prayer with people in a dream, their authority will be perfected, and their rulings will be implemented. If the prayer is interrupted for them, their authority may be cut off, and their rulings will not be enforced. If one prays alone while people pray individually, it may indicate they are Khawarij. If one leads people in a supererogatory prayer, they will enter a guarantee that will not harm them. If people make him an imam, he may inherit an inheritance.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam