Believers! If you follow those who deny the Truth, they will drive you back on your heels, and you will turn about, losers. 149 But: Allah is your Friend, and He is the Best of helpers. 150 We will cast into the hearts of the unbelievers terror, for that they have associated with God that for which He sent down never authority; their lodging shall be the Fire; evil is the lodging of the evildoers. 151 God certainly fulfilled His promise to you when you were fighting the unbelievers, by His permission. Even after We showed you what you wanted, you began to lose courage, started quarreling with each other, and disobeyed God's orders. Some of you want worldly gains and others of you want rewards in the hereafter. Then He let you face defeat in order to test you. However, He forgave you. God is Gracious to the believers. 152 ۞ And when you were going up, and paid no heed for anyone, and the Messenger was calling you from behind; so He rewarded you with grief upon grief that you might not sorrow for what escaped you neither for what smote you. And Allah is Aware of what you do. 153 Then after grief, He sent down a peaceful slumber (calm), which engulfed a group among you – and another party kept fearing for their own lives, thinking wrongfully of Allah – like the thoughts of ignorance; they say, “Do we have any authority in this matter?” Say (O dear Prophet Mohammed – peace and blessings be upon him), “All authority lies only with Allah”; they hide in their hearts what they do not reveal to you; they say, “Had we any control, we would not have been slain here”; say, “Even if you had been in your houses, those destined to be slain would have come forth to their places of slaying; and in order that Allah may test what is in your breasts and reveal whatever is in your hearts”; and Allah knows well what lies within the hearts. 154 Those of you who turned back on the day the two hosts Met,-it was Satan who caused them to fail, because of some (evil) they had done. But Allah Has blotted out (their fault): For Allah is Oft-Forgiving, Most Forbearing. 155