Narrated Ibn 'Abbas (RA):

Allah's Messenger (ﷺ) went out (of al-Madinah, to pray for rain) humbling (himself), wearing rough clothes, submissive, walking slowly, supplicating (Allah). Then, he offered two Rak'at in the same way he prayed 'Eid, but did not deliver your kind of Khutbah (religious talk, sermon). [Reported by al-Khamsah; and at-Tirmidhi, Abu 'Awanah and Ibn Hibban graded it Sahih (authentic)].

عَنِ ابْنِ عَبَّاسٍ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: { خَرَجَ اَلنَّبِيُّ ‏- صلى الله عليه وسلم ‏-مُتَوَاضِعًا, مُتَبَذِّلًا, مُتَخَشِّعًا, مُتَرَسِّلًا, مُتَضَرِّعًا, فَصَلَّى رَكْعَتَيْنِ, كَمَا يُصَلِّي فِي اَلْعِيدِ, لَمْ يَخْطُبْ خُطْبَتَكُمْ هَذِهِ } رَوَاهُ اَلْخَمْسَةُ, وَصَحَّحَهُ اَلتِّرْمِذِيُّ, وَأَبُو عَوَانَةَ, وَابْنُ حِبَّانَ [1]‏ .‏