Dua at the time of iftaar

ثَلَاثَةٌ لَا تُرَدُّ دَعْوَتُهُمْ الْإِمَامُ الْعَادِلُ وَالصَّائِمُ حَتَّى يُفْطِرَ وَدَعْوَةُ الْمَظْلُومِ تُحْمَلُ عَلَى الْغَمَامِ وَتُفْتَحُ لَهَا أَبْوَابُ السَّمَاءِ وَيَقُولُ الرَّبُّ عَزَّ وَجَلَّ وَعِزَّتِي لَأَنْصُرَنَّكَ وَلَوْ بَعْدَ حِينٍ
Rasulullah Salallahu Alaihi Wasallam is reported to have said, "The dua of three people will never be rejected." The Dua of the fasting person at the time of Iftaar, the Dua of a just king, the Dua of an oppressed person. Allah Ta'ala raises his Dua above the heavens and the doors of the heavens are opened for it, and Allah Ta'ala says, By my honour, I will most certainly assist him even though it is after some time.  (Musnad-e-Ahmad)