It was narrated from Abdul laah ibn Umar [Radiyal Laahu Anhu] that our Beloved Prophet  Muhammad [Sallal Laahu Alaiehi Wa Sallam] said:
“There are no days that are greater before Allaah Kareem or in which good deeds are more beloved to Him than these ten days, so recite a great deal of Tahleel, Takbeer and Tahmeed during them.”
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Source: OKARVI