What is the authentic Sunnah of the Prophet (peace be upon him) regarding supplicating against others, and how can we emulate him in this matter, taking into account his supplication against some individuals, such as the man who did not eat with his right hand, and against those who placed the aborted camel fetus on him, as well as his not supplicating against the people of Ta'if, and his saying "Wa 'alaykum" (And upon you) to the Jews who said "As-Samu 'alaykum" (Death upon you)?

The predominant guidance of the Prophet (peace be upon him) was to supplicate for good, guidance, forgiveness, and pardon, hoping for the forgiveness of the wrongdoer and the guidance of the misguided. It is never recorded that he supplicated against a Muslim, except in a few specific, rare cases.

The few instances that deviated from this principle were against enemies who had inflicted severe wounds upon Muslims and had been excessively unjust and tyrannical. In such cases, he supplicated against them to support the oppressed, such as his supplication against Quraysh after severe persecution, against Mudar, and against the disbelievers.

The general principle in the Prophet's guidance was gentleness and mercy. He was compassionate and merciful, and he did not become angry or seek revenge for himself except for the sake of Allah when His sacred limits were violated.

As for the hadith about the man who ate with his left hand, and the Prophet (peace be upon him) supplicated against him, saying, "May you not be able to," it has been interpreted that the man was a hypocrite or that he deliberately defied the religious ruling out of arrogance. This supplication was due to his rejection of the truth and his deliberate transgression.

The Prophet (peace be upon him) supplicated to his Lord to make any cursing or reviling that might issue from him due to human nature a means of atonement, purification, and reward for those who were not deserving of it. This should not be taken as a license for the general public to curse or revile people.

Muslims are urged to follow the Prophet's guidance in forgiveness, pardon, and refraining from cursing and reviling. This is because the bankrupt person on the Day of Resurrection is one who comes with good deeds but also comes having cursed, slandered, and wrongfully consumed the wealth of others. Their good deeds are then taken away, and if their good deeds are exhausted, some of the sins of others are taken and placed upon them, after which they are cast into the Fire. Moreover, those who curse excessively will not be witnesses or intercessors on the Day of Resurrection.