Reference : Hisn al-Muslim 181

الْحَمْـدُ للهِ حَمْـداً كَثـيراً طَيِّـباً مُبـارَكاً فيه،
غَيْرَ مَكْفِيٍّ وَلا مُوَدَّعٍ وَلا مُسْتَغْـنىً عَنْـهُ رَبَّـنا
Alhamdu lillāhi ḥamdan kathīran tayyiban mubārakan fīh, 
ghayra makfiyyin wa lā muwadda`in, 
wa lā mustaghnan `anhu Rabbanā.


All praise is to Allah, praise in abundance, good and blessed. It cannot [be compensated for, nor can it] be left, nor can it be done without, our Lord.

Reference:
Al-Bukhari 6/214, At-Tirmidhi 5/507.

Chapter: Upon completing the meal