And now, it was not you who sent me here, but Hashem.
The Ohr Hachaim explains this possuk as a continuation of before. Yosef wished to remove the hatred from their hearts. He wanted to remove from them the slightest suspicion that Yosef still hated them for their cruelty to him. It would be hard for them to believe that Yosef had fully forgiven them and was ready to act to them as a regular brother. They would consider themselves worthy of being hated.
Now that he could see quite clearly that the entire sequence of events that brought him to Mitzrayim was clearly the hand of Hashem, and now they could all see how the brothers’ hand was entirely incidental. There was no reason for them to be considered enemies.
The Ohr Hachaim explains that this could be how the brothers managed to face their father after this story. He writes that it is unlikely that Yaakov never found out that the brothers sold Yosef. Yaakov must have inquired as to what had happened to his son, and eventually he must have heard what happened. He must have asked about the bloody shirt that he was shown and how it got to be that way if Yosef was not killed.
Yosef pre-empted his father’s anger by announcing that no harm was done, and their hands were clean. The brothers were mere pawns in Hashem’s plan to ensure that Yosef have a job as a father to Par’oh. As Chazal tell us, Yaakov would have been dragged to Mitzrayim with iron chains, but Hashem took pity on him and he went there with great honor.
