Surah 49. Al-Hujurat, Ayah 1

I.e., "do not allow your own desires to have precedence".

Several shades of meaning are implied: (1) do not make yourselves conspicuous in word or deed when in the presence of Allah (e.g. in a Mosque, or at Prayers or religious assemblies): (2) do not anticipate in word or deed what your Leader (Allah's Messenger) may say or do; (3) do not be impatient, trying to hasten things before the time is ripe, of which the best Judge is Allah, Who speaks through His Messenger. Be reverent in all things, as in the presence of Allah: for He hears and sees all things. (4) Look to the Qur-an and the Sunnah of the Prophet (peace be on him) for guidance and let nothing else take precedence of them.