Those who join forces for good will receive a reward for it. Those who join forces for evil will be answerable for it. Allah oversees all things. (Qur'an, 4:85)
He (Ya'qub) said, 'How will my trusting him to your care be different from entrusting his brother before? The Best of Guardians, however, is Allah. He is the Most Merciful of the merciful.' (Qur'an, 12:64)
He (his son) said, 'I will take refuge on a mountain; It will protect me from the flood.' He said, 'There is no protection from Allah's command today except for those He has mercy on.' The waves surged in between them and he was among the drowned. (Qur'an, 11:43)
He had no authority over them except to enable Us to know those who believe in the hereafter from those who are in doubt about it. Your Lord is the Preserver of all things. (Qur'an, 34:21)