Sayyidina Abdullah (RA) said : Allah’s Messenger (SAW) taught us the tashahhud for the salah and the tashahhud for some need. The tashahhud in salah is:
All adorations of the tongue are for Allah, as also those of the body and wealth or good things. Peace be on you, 0 Prophet, and Allah’s mercy and His blessings. Peace be on us and on all righteous slaves of Allah. I bear witness that there is no God but Allah and I bear witness that Muhammad is His slave and His Messenger.
And, the tashahhud in case of need, like marriage, is:
All praise belongs to Allah. We ask Him for help and seek His forgiveness. And we seek refuge in Allah from the evils of our ownselves, and (from) our wicked deeds. He whom Allah guides, none can send astray, and he whom He leaves to stray, there is no guide for him. And I testify that there is no God but Allah, and I testify that Muhammad is His slave and His Messenger”.
Then three verses of the Qur’an are recited. Abthar said that Suf yan Thawri specified them:
“(0 you who Believe)0 Fear Allah as He should be feared, and die not save you be Muslims. (3: 102)
(0 mankind!) Fear your Lord, Who created you from a single person, and from him He created his mate, and from the twain He spread abroad many men and women. So fear Allah by whom you demand (you rights) of one another, and fear (breaking) kinship of wombs. Surely Allah is ever watchful over you. (4: 1)
(0 you who believe!) Fear Allah and speak words straight to the point. He will set right your deeds for you and will forgive your sins, and whosoever obeys Allah and His Messenger, he indeed hasgained a mighty trimph. (33: 70-71)
[Ahmed 3877, Abu Dawud 2118, Muslim 3274, Ibn e Majah 1892]