Prayers and Meditations — Paragraph 34
Source (Arabic)
يا إِلهِي أَسْئَلُكَ بِاسْمِكَ الأَعْظَمِ بِأَنْ تَجْمَعَ أَحِبَّائَكَ عَلَى شَرِيعَةِ رِضائِكَ ثُمَّ أَنْزِلْ عَلَيْهِمْ ما يُطَمْئِنُهُمْ، وَإِنَّكَ أَنْتَ
Translation
Glorified be Thou, then, O my God! I beseech Thee by Thy Most Great Name to assemble them that love Thee around the Law that streameth from the good-pleasure of Thy will, and to send down upon them what will assure their hearts.