Imam Mahdi’s (PBUH) first words after the birth

Lady Hakimah (Imam Jawad (PBUH)’s daughter) says: “I was with Imam Hassan Askari (PBUH) on the seventh day after Imam Mahdi’s (PBUH) birth. He told his son: “Son! Speak.” And he said: “I testify there is no God but Allah” and he saluted Prophet Muhammad (PBUH) and Imam Ali (PBUH) and the holy Imams till he came to his father’s name. Then he said:”

“In the name of Allah, Most Gracious, Most Merciful, And we wished to be Gracious to those who were being depressed in the land, to make them leaders (in Faith) and make them heirs.” [The Quran - Surah 28 - Verse 5]

The Keyword of Mahdism Verses, p. 309

Kamal al-Din and Tamam al-Nimeh, v. 2, p. 424