Reference : Hisn al-Muslim 215

سَمِـعَ سـامِعٌ بِحَمْـدِ اللهِ وَحُسْـنِ بَلائِـهِ عَلَيْـنا.
رَبَّنـا صـاحِبْـنا وَأَفْـضِل عَلَيْـنا 
عائِذاً باللهِ مِنَ النّـار
Sami`a sāmi`un biḥamdillāhi wa ḥusni balā'ihi `alaynā. 
Rabbanā ṣāḥibnā, wa afḍil `alaynā, 
`ā'idhan billāhi minan-nār.


He Who listens has heard that we praise Allah for the good things He gives us. 
Our Lord, be with us and bestow Your favor upon us. 
I seek the protection of Allah from the Fire.

Reference:
Muslim 4/2086, the meaning of sami`a sāmi`un (who listens has heard) is 
that 'a witness has witnessed our praise of Allah due to His blessings and 
favor upon us.' It could also be read samma`a sāmi`un, in which case it 
means 'one who has heard this statement of mine will convey it to another 
and he will say it as well.' This is due to the attention given to the 
Thikr (remembrance of Allah) and supplications made during the early 
morning hours. The meaning of his saying 'Our Lord, be with us and bestow 
Your favor upon us' is: 'Our Lord, protect us and guard us. Bless us with 
Your numerous bounties, and avert from us every evil.' See An-Nawawi, Sharh 
Sahih Muslim 17/39.

Chapter: Prayer of the traveller as dawn approaches