Selected Sayings of The Holy Prophet of Islam — Page 25
32. Abu Hurairah, God be pleased with him, narrates, that the Holy Prophet, peace and blessings of Allah be upon him, said: "Of what use to Allah is the fast of one who does not abstain from lying and from deceit. " (Bukhari) 33. Ayesha, God be pleased with her, narrates that the Holy Prophet, peace and blessings of Allah be upon him,would remain confined to the mosque (Etikaf) for the last ten days of the month of Ramadhan. After his demise, his wives continued to observe the (Etikaf) in the same manner. (Bukhari) 25