Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "There is nothing more valuable in the sight of Allah than supplication (du'a)."

Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him), the Prophet (peace and blessings of Allah be upon him) said: "The most excellent and superior act of worship is supplication (du'a)."

It is narrated from Sayyiduna Nu'man bin Bashir (may Allah be pleased with them both) that the Prophet (peace and blessings of Allah be upon him) said: "Supplication is worship." Then he (peace be upon him) recited this verse: «وَقَالَ رَبُّكُمُ ادْعُونِي أَسْتَجِبْ لَكُمْ» [غافر: 60] "Call upon Me; I will respond to you."

It is narrated from Sayyidah Aisha (may Allah be pleased with her), she says that the Prophet (peace and blessings be upon him) was asked: Which act of worship is the best? He (peace and blessings be upon him) replied: "A person's supplication for himself."

It is narrated from Sayyiduna Ma'qil bin Yasar (may Allah be pleased with him), he says: I was present with Sayyiduna Abu Bakr Siddiq (may Allah be pleased with him) in the service of the Prophet (peace and blessings of Allah be upon him), so the Prophet (peace be upon him) said: "O Abu Bakr! Indeed, shirk (associating partners with Allah) comes among you more hidden than the crawling of an ant." Sayyiduna Abu Bakr (may Allah be pleased with him) said: Is there shirk other than associating someone with Allah? The Prophet (peace be upon him) said: "By the One in Whose hand is my soul, indeed shirk enters in a way more hidden than the crawling of an ant. Shall I not guide you to such words that when you say them, all minor and major shirk will be removed from you?" The Prophet (peace be upon him) said: "Say: O Allah! I seek refuge in You from knowingly associating partners with You, and I seek Your forgiveness for what I do not know."