Al-Waqi'ah Verse 26

only good and virtuous speech.[[ Another possible translation: “only exchanging greetings of peace.”]] 

except the words of peace, peace.

only the saying 'Peace, Peace!'

only clean and wholesome speech.

Nought but the saying: peace! peace!

Only the saying, "Peace! Peace".

All talk will be sound and upright.

Other than "Peace, peace" the salutation.

Except the saying, “Peace, peace.”

but only the watchword, ‘Peace!’ ‘Peace!’

(They will hear) only speech (wishing) peace and security after peace and security.

But (all that they hear on all sides will be) good and pure words (of salutation) - `Peace be, peace be.´

Except little : "Greeting/peace ." (And): "Greeting/peace

Except the saying, “Peace, peace.”

Except the saying, "Peace! Peace

But only the saying of: Salam!, Salam! (greetings with peace)!

They hear therein no vain or sinful talk --

Except the word peace, peace.

(Naught) but the saying: Peace, (and again) Peace.

except each other's greetings of, "Peace be with you".

but only the saying: 'Peace, Peace'

But only the saying of: "Salaman! Salaman!"

only the words of peace and tranquillity.

But only the greeting: “Peace, peace.”

but only the saying, `Peace!' `Peace!' (salman salman substitutes for qlan, `the saying') which they will hear.

No Laghw (evil vain talk) will they hear therein, nor any sinful speech. But only the saying of;

"Salaman (peace,)!
Salaman (peace.)!"

meaning they will not hear foul or unnecessary speech in Paradise.

لااَّ تَسْمَعُ فِيهَا لَـغِيَةً

Where they shall neither hear harmful speech nor falsehood. (88;11),

meaning, no foul words are uttered therein.

Allah said,
وَلَا تَأْثِيمًا
(nor any sinful speech), meaning, nor speech that contains foul words,
إِلاَّ قِيلً سَلَمًا سَلَمًا
(But only the saying of;"Salaman (peace!), Salaman (peace!).", they will greet each other with Salam, just as Allah said in another Ayah,

تَحِيَّتُهُمْ فِيهَا سَلَـمٌ

Their greeting therein will be;"Salaman (peace!)." (14;23)

And, as we mentioned, their words will be free from impure and needless speech

But only " Peace, peace be upon you " a greeting addressed by the angels who express good will