O Allah, unite the ranks of the Muslims and bring their hearts together. — The Ummah
اللَّهُمَّ وَحِّدْ صُفُوفَ الْمُسْلِمِينَ وَأَلِّفْ بَيْنَ قُلُوبِهِمْ
Transliteration: Allaahumma wahhid sufoofal-muslimeena wa allif bayna quloobihim
Translation: O Allah, unite the ranks of the Muslims and bring their hearts together.
Reference: General supplication