This address is made when the Prophet (peace and blessings be upon him) had been driven out of his home town, was being chased by his people who wanted to kill him, and had not yet reached his new base, Madinah. He was at al-Juhfah, close to Makkah where the danger was very close. His eyes frequently turned to his home town which he so dearly loved. He only left it for the sake of his message. Otherwise, Makkah was the place where he had spent all his life, the place of his memories, and where his relatives lived.
In this desperate situation he is told:
{He who has made the Qur’an binding on you will surely bring you back to the place of return.} (Al-Qasas 28: 85)
God, who has given you the Qur’an and the task of delivering His message will not abandon you, or allow the unbelievers to chase you out of your place and home town. He will not allow them to impose their will on you or to oppress the believers with you.
He has made the Qur’an binding on you so as to give you support through it at the time He judges to be right. If you are driven out today and being chased in all directions, you will certainly return with larger support.
God, in His infinite wisdom, decided to give Muhammad, His servant, this true promise at such a stressful time, so that he could go along his way comforted, confident and reassured by God’s promise. He does not entertain the slightest doubt that God’s promise will come true.
Indeed, God’s promise applies to all those who follow the same way. Anyone who suffers hardship and adversity for God’s sake and bears this with patience and perseverance will ultimately be given support against the oppressors. God will take over the battle on their behalf when they have given all that they can in fulfillment of their duty.
{He who has made the Qur’an binding on you will surely bring you back to the place of return.} (Al-Qasas 28: 85)
He had formerly returned Moses to the land from where he fled, and with his return he saved the oppressed community and destroyed Pharaoh and his noblemen. It was the God-fearing who ultimately triumphed.
Hence, you also, Muhammad, should go along your way, leaving the question of judgment between you and your people to God Almighty: {Say: My Lord knows best who has come with right guidance, and who is lost in obvious error.} (Al-Qasas 28: 85)
Leave the matter to God and He will requite both those who follow right guidance and those who remain in error. -onislam.net


