Abd al-Rahman bin Yazid narrates: "There is an hour in which, whenever I came to him, I found him standing in prayer, (namely) between Maghrib and Isha" - meaning (he said this about) Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9416