The Prophet (peace and blessings be upon him) used to supplicate: O Allah, protect me with Islam while standing

It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to make this supplication: 'Allahummahfazni bil-islami qa'iman, wahfazni bil-islami qa'idan, wahfazni bil-islami raqidan, wa la tushmit bi 'aduwwan hasidan. Allahumma inni as'aluka min kulli khayrin khaza'inuhu biyadik, wa a'udhu bika min kulli sharrin khaza'inuhu biyadik' (O Allah, protect me with Islam while standing, while sitting and while sleeping, and do not give any envious enemy the chance to rejoice over me. O Allah, I ask You for every good whose treasures are in Your Hand, and I seek refuge in You from every evil whose treasures are in Your Hand).
This hadith is sahih (authentic) on the condition of Imam Bukhari, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that among the supplications of the Messenger of Allah (peace and blessings be upon him) was also this one: 'Allahumma inna nas'aluka mujibati rahmatik, wa 'aza'ima maghfiratik, was-salamata min kulli ithm, wal-ghanimata min kulli birr, wal-fawza bil-jannah, wan-najata bi'awnika minan-nar' (O Allah, we ask You for the things that bring about Your mercy, the deeds that make Your forgiveness certain, safety from every sin, an abundant share of every righteous deed, success in attaining Paradise, and salvation from the Fire with Your help).
This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it.