The word abada appears several times in phrases like "...beneath which rivers flow, abiding therein forever..."
"Their reward is with Allah: Gardens of Eternity, beneath which rivers flow; they will dwell therein forever; Allah well pleased with them, and they with Him: all this for such as fear their Lord and Cherisher." (Qur'an 98:8)
...ma kasini fihi abadan...
(18:3) (A state of bliss) in which they shall dwell forever.
...Qala ya Musa inna lan nad khulaha abadan...
(5:24) They said: O Moses, behold! never shall we enter that land.
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Alahumma inni as-`aluka fahm an-nabiyya wa hifdh al-mursalin al-muqarrabin!
Oh Allah! I ask you for the understanding of the prophets and the memory of the messengers, those nearest to you!