And [He turned in His mercy, too,] towards the three [groups of believers] who had fallen prey to corruption, until in the end-after the earth, despite all its vastness, had become [too] narrow for them and their souls had become [utterly] constricted they came to know with certainty that there is no refuge from God other than [a return] unto Him; and thereupon He turned again unto them in His mercy, so that they might repent: for, verily, God alone is an acceptor of repentance, a dispenser of grace.