Yahya related to me from Malik from Abd ar-Rahman ibn Harmala al- Aslami from Said ibn al-Musayyab that the Messenger of Allah ﷺ said, "What separates us from the hypocrites is being present at isha and subh. They cannot do it," or words to that effect.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ بَيْنَنَا وَبَيْنَ الْمُنَافِقِينَ شُهُودُ الْعِشَاءِ وَالصُّبْحِ لاَ يَسْتَطِيعُونَهُمَا أَوْ نَحْوَ هَذَا