Dua Nudba - دعاء الندبة Sayed Mehdi Mirdamad -سید مهدی میر داماد 

Mirdamad reciting Dua Nudba..
'Dua' means 'to call or to seek help'. 'Nudba' means to cry or wail. The Shia books of traditions lay great stress upon 'Dua'. Dua is the weapon of the believer, the essence of belief and the connection between the Creator of the universe and his slaves. One of the treasure of Duas is a pearl, known as Dua-e-Nudba.
It is an important and authentic Dua. It's deep meaning penetrates to the depths of the heart. This is enough proof that these are not the words of an ordinary person. They are uttered by the personality who has connection with the celestial world (Aalam-e-Malakoot).
Allamah Muhammad Baqir Majlisi (ra) has quoted this Dua in 'Zaad-ul-Maad' from Imam Jafar-e-Sadiq (as). It is for the Imam of the time. And Muhammad bin Ali bin Abi Khura has quoted this dua from the book of Muhammad bin Husain bin Sufyan Bazoofari, from Imam-e-Asr. Apart from this, great Shia scholar Sayed Raziuddin bin Tawoos has mentioned it in his book, "Iqbal" on page no.295 to 299. Muhammad bin Jafar Mashadi Haeri has recorded it in book Al-Mazaan (Dua no.107). Qutb Rawandi in Al-Mazaar also records it and so does Allamah Majlisi in 'Zaad-ul-Maad' and 'Beeharul Anwaar'. Shaykh Abbas Qummi too has narrated it in his book, 'Mafatihul Janan'.
Let us see how the magnificent personality of Imam-e-Asr (as) is introduced in this Dua:
"Where is the Last Proof of Allah. The one who is a link of the chain of guidance of the purified progeny of the Prophet (pbuh) without whose presence this system cannot remain?"
The word 'Baqiyatullah' is used here. It is from the verse of the Holy Quran:
"What remains with Allah is better for you if you are believers." (Surah Hud, Verse 86)
It is evident that the world cannot be bereft of the Proof of Allah. And the one from the progeny of the Holy Prophet (pbuh) remaining of this earth is only our Imam Hazrat Mahdi (as). It is reported in the traditions,
"If the Proof of Allah is not present the earth will sink."
The earth is still remaining as it was. This proves the existence of a divine proof.