An-Nu’man bin al-Bashir (RAA) narrated that the Messenger of Allah (ﷺ) said:

“Verily supplication is worship.” Related by the four Imams and At-Tirmidhi graded it as Sahih,

وَعَنِ النُّعْمَانِ بْنِ بَشِيرٍ ‏-رَضِيَ اَللَّهُ عَنْهُمَا‏- عَنِ النَّبِيِّ ‏- صلى الله عليه وسلم ‏-قَالَ: { إِنَّ اَلدُّعَاءَ هُوَ اَلْعِبَادَةُ } رَوَاهُ اَلْأَرْبَعَةُ, وَصَحَّحَهُ اَلتِّرْمِذِيُّ .‏ [1]‏