Rasoolullaah Sallallaahu 'Alayhi Wa Sallam said: There are no days greater to Allaah or more beloved to do good deeds in them than these ten days (of dhul hijjah), so increase in them Tahleel (Laa Ilaaha Illallaah) and Takbeer (Allaahu Akbar) and Tahmeed (Alhamdulillaah).Reported by Imaam Ahmad Rahimahullaah in his Musnad.