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"Say (O Muhammad sal-Allaahu 'alayhe wa sallam): My Lord has commanded justice and (said) that you should face Him only (i.e, worship none but Allaah and face the Qiblah, i.e, the Ka'bah at Makkah during prayers) in each and every place of worship, in prayers (and not to face other false deities and idols), and invoke Him only making your religion sincere to Him by not joining in worship any partner to Him and with the intention that you are doing your deeds for Allaah's sake only, As He brought you (into being) in the beginning, so shall you be brought into being (on the Day of Resurrection) [in two groups, one as a blessed one (believers), and the other as a wretched one (disbelievers)]." [Al-A'raaf (7):29]

Narrated Abu Wail:

'Abdullah used to give a religious talk to the people on every Thursday. Once a man said, "O Aba 'Abdur-Rahman! (By Allah) I wish if you could preach us daily." He replied, "The only thing which prevents me from doing so, is that I hate to bore you, and no doubt I take care of you in preaching by selecting a suitable time just as the Prophet used to do with us, for fear of making us bored." [The Book of Knowledge Volume 1, Book 3, Hadeeth 70]