Silsilat al-Ahadith al-Sahihah

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that Sayyiduna Abu Dharr (may Allah be pleased with him) said: O Messenger of Allah! The wealthy have taken all the reward, (in that) they pray as we pray and fast as we fast, but they have extra wealth, so they give charity, and we do not have wealth so that we may give charity. The Messenger of Allah (peace and blessings of Allah be upon him) said: "Abu Dharr! Shall I not teach you some words by which you will catch up with those who have gone ahead, and none among those who come after you will reach your rank, except one who does as you do? After every prayer, say thirty-three times «الله اكبر», thirty-three times «الحمد لله», and thirty-three times «سبحان الله», and at the end recite this phrase: «لا إله إلا الله وحده لا شريك له، له الملك وله الحمد وهو على كل شيء قدير» There is no deity worthy of worship except Allah, He is alone, He has no partner, to Him belongs the dominion, to Him belongs all praise, and He is over all things competent. Whoever does this, his sins will be forgiven even if they are as much as the foam of the sea."