Ash-Shu'araa • BN-TAFSEER-IBN-E-KASEER
﴿ عَلَىٰ قَلْبِكَ لِتَكُونَ مِنَ ٱلْمُنذِرِينَ ﴾
“upon thy heart, [O Muhammad] so that thou mayest be among those who preach”
Please check ayah 26:195 for complete tafsir.