لَقَد

لَقَد is a phrase (شِبْهُ الجُمْلَةِ) consisting of a particle of emphasis and a particle of certainty.

PhraseParticle/ParticleParticleParticle
شِبْهُ الجُمْلَةِ حَرْفُ التَّوْكِيْدِ وَحَرْفُ تَحْقِيْقٍحَرْفُ تَحْقِيْقٍحَرْفُ التَّوْكِيْدِ
PhraseParticle, particleparticle of certaintyparticle of emphasis 
  
Indeed, certainlyلَقَد=قَدْ+لَ
 Indeed, certainlycertainlyIndeed
Surah/Below are the 179 (172+7) verses in the holy Quran containing the compoundلَقَد
Verse
Surely you knew those among you who transgressed regarding the Sabbathوَلَقَدْ عَلِمْتُمُ الَّذِيْنَ اعْتَدَوْا مِنْكُمْ فِي السَّبْتِ
2-65We said to them “Be you monkeys despised and rejected”فَقُلْنَا لَهُمْ كُوْنُوْا قِرَدَةً خَسِئِيْنَ
2-87
2-92
2-99
2-102
2-130
3-123
3-143
3-152
3-155
3-164
3-181
60-6
67-5
67-18
81-23and certainly, he saw him in the clear horizonوَلَقَد رَءَاهُ بِالأُفُقِ المُبِيْنِ
90-4Indeed, we have created man in toilلَقَد خَلَقْنَا الإِنْسَانَ فِي كَبَدٍ
95-4Indeed, undoubtedly, We created man in the best formلَقَد خَلَقْنَا الْإِنْسَانَ فِي أَحْسَنِ تَقْوِيْمٍ