Rajab is the Month of God

The three most sacred months of the Islamic year are Rajab, Shaban and Ramadan. Rajab is the month of Allah, Shaban is the month of the Prophet, peace and blessings be upon him, Ramadan is the month of the jamaad, the community, and we try as much as possible to stay together, break the fast together and pray tarawih, the evening prayer of Ramadan together.
The month of Rajab is a month of forgiveness and fasting, a month that is likened, in a hadith to winds that bring clouds, while Sha’aban is like the month where rain clouds gather, and Ramadhan is the month that the rain falls. These three holy months are very important for all those aspiring for nearness to Allah.
In general, during the holy month of Rajab it is good to recite 16,000 times Ya Latif; to pray in honor of this month another 30 Rakaat, during the month or all at once. The 27th day falls on the night of Miraj, the ascension into heaven, and it is good to observe the fast on that day, to stay awake at night and to do the dhikr or pray.
The holy Prophet (s.a.w.s.) said: “The month of Rajab is the great month of Allah, not related to other months in respect and meaning; the war during this month is prohibited; in truth, Rajab is the month of Allah, Sha’aban is my month and Ramadan the month of my Ummah; whoever fasts a day in the month of Rajab will be granted the great reward of Ridwan (become angel in heaven; the wrath of Allah will be removed and a gate of hell will be closed. Fasting is one of the most recommended practices during this spiritual season.”
Prophet (s.a.w.s.) also said, “Whoever fasts the entire month of Rajab, will be granted three gifts: forgiveness from past sins, protection for the rest of his life, and he will be saved from thirst on Judgement day.” When a Companion (Sahabah) told the Prophet (s.a.w.s.) that he could not fast the entire month due to his old age, the Prophet (s.a.w.s.) advised him to fast at least one day in the beginning, one day in the middle and one day at the end of the month. “Whoever fasts for one day at the beginning, for one day in the middle, and for one day at the end of the holy Rajab, the reward is as if he fasted the whole of Rejab and it is given to him.”

Source: http://www.sufiway.eu/the-holy-months-rajab-shaban-ramadan/

English Translation:
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Dua of the Wali Abbas to read 3 times everyday in Rajab

Bismillah ir-Rahman ir-Raheem Allahuma innee istaghfiruka min kulli maa tubtu lahu ilayka thumma 'udtu feeh. wa istaghfiruka min kulli maa 'aradtu bihi wajhika wa-khaalatanee feehi maa laysa feehi ridaak. wa istaghfiruk li-ni`am allatee taqawwaytu biha `ala ma`aseeyatik. wa istaghfiruka min aadh-dhunub allatee laa ya`lamahu ghayruka wa laa yattali`u `alayha ahadu n siwaak wa laa yasa`uha illa rahmatika wa la tunjee minha illa maghfiratuka wa hilmuka. laa ilaha illa-Anta, subhaanak! innee kuntu min adh-dhaalimeen. Allahuma innee istaghfiruka min kulli dhulmin dhalamtu bihi `ibadaka. Fa ayyaama `abdin min `ibaadik aw `amatin min 'imaa'ika dhalamtu fee badanihi aw `irdihi aw maalih fa `atihi min khazaa'inik allatee laa tanqus. Wa as'aluka an tukrimanee bi rahmatika allatee wasi`at kulla shay wa laa t`uheenanee min `adaabik wa ta`teeayanee maa as'aluka fa-innee haqeequn bi-rahmatik ya arham ur-Raahimeen. Wa salla-Allahu `ala Sayiddina Muhammadin wa `ala alihi wa sahbihi ajma`een. wa laa hawla wa laa quwatta illa billah il-`Alee ul-'Aadheem

In the name of Allah, the All-Beneficent, the All-Merciful O Allah, I ask forgiveness of You for everything for which I repented to You then returned to. And I ask forgiveness of You for everything I displeased You with and all that concerns me with which You are displeased. And I ask forgiveness of You for the favors which I used for increasing my disobedience towards You. And I ask forgiveness of You for the sins which no one knows except You and no one sees except You and nothing encompasses except Your Mercy and nothing delivers from except Your forgiveness and clemency. There is no god except You alone. You are the Most High, and I was one of the [self] oppressors! O Allah, I ask forgiveness of You for the injustice I committed against Your servants. Whatever of Your male or female servants whom I have hurt, physically or in their dignity or in their property give them of Your bounty which lacks nothing. And I ask You to honor me with Your mercy which encompasses all things. Do not humble me with Your punishment but give me what I ask of You, for I am in great need of Your mercy, O Most Merciful of the merciful. May Allah send blessings upon Muhammad and upon all his companions. There is no power and no might except in Allah the High, the Exalted.