Ash-Shu'araa • BN-TAFSEER-IBN-E-KASEER
﴿ وَتَتَّخِذُونَ مَصَانِعَ لَعَلَّكُمْ تَخْلُدُونَ ﴾
“and make for yourselves mighty castles, [hoping] that you might become immortal?”
Please check ayah 26:135 for complete tafsir.