• أَلْحَقْتُم
• أَلْحَقْنَا
• أَلْحِقْنِى
• يَلْحَقُوا۟

Appears 6 times in the Quran.

1. 3:170 فَرِحِينَ بِمَآ ءَاتَىٰهُمُ ٱللَّهُ مِن فَضْلِهِۦ وَيَسْتَبْشِرُونَ بِٱلَّذِينَ لَمْ يَلْحَقُوا۟ بِهِم مِّنْ خَلْفِهِمْ أَلَّا خَوْفٌ عَلَيْهِمْ وَلَا هُمْ يَحْزَنُونَ

   Rejoicing in what Allah has given them out of His grace and they rejoice for the sake of those who, (being left) behind them, have not yet joined them, that they shall have no fear, nor shall they grieve.
   

2. 12:101 رَبِّ قَدْ ءَاتَيْتَنِى مِنَ ٱلْمُلْكِ وَعَلَّمْتَنِى مِن تَأْوِيلِ ٱلْأَحَادِيثِ فَاطِرَ ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ أَنتَ وَلِىِّۦ فِى ٱلدُّنْيَا وَٱلْءَاخِرَةِ تَوَفَّنِى مُسْلِمًا وَأَلْحِقْنِى بِٱلصَّٰلِحِينَ

   My Lord! Thou hast given me of the kingdom and taught me of the interpretation of sayings: Originator of the heavens and the earth! Thou art my guardian in this world and the hereafter; make me die a muslim and join me with the good.
   

3. 26:83 رَبِّ هَبْ لِى حُكْمًا وَأَلْحِقْنِى بِٱلصَّٰلِحِينَ

   My Lord: Grant me wisdom, and join me with the good
   

4. 34:27 قُلْ أَرُونِىَ ٱلَّذِينَ أَلْحَقْتُم بِهِۦ شُرَكَآءَ كَلَّا بَلْ هُوَ ٱللَّهُ ٱلْعَزِيزُ ٱلْحَكِيمُ

   Say: Show me those whom you have joined with Him as associates; by no means (can you do it). Nay! He is Allah, the Mighty, the Wise.
   

5. 52:21 وَٱلَّذِينَ ءَامَنُوا۟ وَٱتَّبَعَتْهُمْ ذُرِّيَّتُهُم بِإِيمَٰنٍ أَلْحَقْنَا بِهِمْ ذُرِّيَّتَهُمْ وَمَآ أَلَتْنَٰهُم مِّنْ عَمَلِهِم مِّن شَىْءٍ كُلُّ ٱمْرِئٍۭ بِمَا كَسَبَ رَهِينٌ

   And (as for) those who believe and their offspring follow them in faith, We will unite with them their offspring and We will not diminish to them aught of their work; every man is responsible for what he shall have wrought.
   

6. 62:3 وَءَاخَرِينَ مِنْهُمْ لَمَّا يَلْحَقُوا۟ بِهِمْ وَهُوَ ٱلْعَزِيزُ ٱلْحَكِيمُ

   And others from among them who have not yet joined them; and He is the Mighty, the Wise.