بَارَكَ اللّهُ لَكَ، وَبَارَكَ عَلَيْكَ، وَجَمَعَ بَيْنَكُمَا فِي خَيْرٍ

May Allāh bless for you (your spouse) and bless you, and may He unite both of you in goodness.

Reference: May Allāh bless for you (your spouse) and bless you, and may He unite both of you in goodness. Abū Dāwud (#2130), al-Tirmidhī (#1091), and Ibn Mājah (#1905). Also see _Ṣaḥīḥ Ibn Mājah_ (1/324).