It is narrated from Sayyiduna Tamim Dari (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever says «لَا اِلَهَ اِلَّا اللَّهُ وَاحِدً اَحَدً صَمَدً لَمْ يَتَّخِذْ صَاحِبَةً وَلَا وَلَدً وَلَمْ يَكُنْ لَهُ كُفُواً اَحَدً» ten times, forty thousand good deeds will be written for him."