Hadhrat Ubadah bin Saamit (Radiyallahu Anhu) narrates that Rasulullah (Sallallahu Alayhi Wasallam) used to teach the Sahabah (Radiyallahu Anhum) the following Dua at the approach of the Month of Ramadhaan:
O Allah! Safeguard me for the Month of Ramadhaan (by making me see the Month of Ramadhaan healthy and fit so that I can take maximum benefit from it), and safeguard the Month of Ramadhaan for me (by making the conditions in it such that I can take maximum benefit from it) and accept it from me. (Tabrani)