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Yahya related to me from Malik from Ata ibn Abi Muslim that Abdullah al-Khurasani said, "The Messenger of Allah, may the peace and blessings of Allah be upon him, said: 'Shake hands and rancor will disappear. Give presents to each other and love each other and enmity will disappear.' "
Islam is the religion of brotherhood, love, cooperation on righteousness and piety, and devotion to Allah the Almighty.
The true believer is the one who does not feel any jealousy nor hatred or envy to his brother. He keeps his faith based bond free from any thing that may affect it. Moreover, he maintains the friendliness atmosphere as much as he can.
The relationship of the believer with another believer is like (the bricks of) a building, each one strengthens the other. If the relationship between the believer and his fellow believer is affected by any of the satanic symptoms, then the believer shall hasten to rectify it before the danger becomes severe; he seeks refuge in Allah from the accursed Satan, then he shortly apologizes to his brother for what he has done, and repent and ask forgiveness. After he rectifies his error, he shall resolute to be better than he was.
The Prophet (may the peace and blessings of Allah be upon him) said:
'Shake hands and rancor will disappear."
This is one of the greatest means to purify the souls and remove their hatred, hostility and rancor. But shaking hands has further meanings
If the faithful shake hands, it is as if they have agreed to renew love, affection and brotherhood.
The connection of hands is a reason for the connection of the hearts, so long as the two believers met and agreed to shake hands with his brother, then surely the hostility will go away, and they just have to reprimand if there is a need to do so, or to simply forgive each other.
A Muslim should be cheerful when he meets his brother and supplicate for him with the goodness of the world and the Hereafter.