An evidence for this is a special Dua for this month quoted...

An evidence for this is a special Dua for this month quoted in Iqbal and Zaadul Maad from the fourth Imam, Imam Zainul Abideen (as) and his son, Imam Muhammad Baqir (as) which begins as follows: اللهم هذا شهر رمضان، وفيه: أسألك.. ان تنصر وصي محمد، وخليفة محمد، والقائم بالقسط من أوصياء محمد، صلواتك عليه وعليهم، اعطف عليهم نصرك...

O Allah, this is the month of Ramadan… I ask You to help the vicegerent of Muhammad and the successor of Muhammad and the one who will establish justice from the successors of Muhammad. Your blessings be upon him and them. Bestow Your help to them.

Supporting this point also is the traditional report that Thiqatul Islam, Muhammad Ibne Yaqoob Kulaini has recorded in the Chapter of Fasting, in Usool Kafi from Muhammad bin Isa through his own chain of narrators from the Holy Imam (as) that they said: Recite this Dua on the eve of 23rd of Ramadan in Sajdah (prostration), in sitting and standing, and go on repeating it as much as you can. So much so, that you learn it by heart for your life.

Thus after praise and glorification of the Almighty Allah recite as follows: اللهم كن لوليك فلان ابن فلان في هذه الساعة، وفي كل ساعة وليا، وحافظا، وناصرا، ودليلا، وقائدا، وعينا، حتى تسكنه أرضك طوعا، وتمتعه فيها طويلا.

O Allah You be for so and so, at this hour and at every hour a Guardian, a protector, a leader, a helper, a guide and a protector, so that he is at ease and lives on your earth for a long time.[^2] I say: This tradition proves that praying for the important matter of hastening the reappearance is emphasized on the 23rd eve of Ramadan of all the times and occasions just as the month of Ramadan is more emphasized than other months.

It is so because it is the best time for acceptance of supplications and gaining the best rewards. And also the angels and Ruhul Qudus come down on this night and the doors of mercy and success are thrown open and they are not thrown open on other nights. Rather it has been clearly mentioned in some traditional reports that this night is the same night of Qadr (power), which is better than a thousands months.