historic Roman Catholic temple, belonging to the parish of Saint Antoniego w Sokółka [2], located in Sokółka, built in the years 1840–1848 in the classicist style with two towers, thanks to the efforts of the dean, Father Józef Kryszczun.
On October 2, 2011, the Eucharist was placed on public display in the reliquary in the church nave.
April 9, 2009 church Saint Anthony in Sokółka was raised to the rank of a collegiate church and the Collegiate Chapter of the Blessed Sacrament was established there. On March 25, 2017, the collegiate church was raised to the rank of a sanctuary
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Eucharistic miracle
On October 12, 2008, while giving Holy Communion, Fr. vicar Jacek Ingielewicz picked up a slightly dirty host from the floor, which was shown to him by a woman waiting for Holy Communion. In accordance with established liturgical regulations, the communicant was placed in a vasculum filled with water, in which it was supposed to dissolve. The vessel was locked in a safe in the sacristy. After a week, a stain that appeared to be blood was found in the vessel on the immersed host. On October 30, 2008, the host was taken out and placed on the corporal, which left a red mark on it.
The Białystok episcopal curia, informed about the event, ordered the examination of host samples by two pathologists (Prof. Stanisław Sulkowski and Prof. Maria Sobaniec-Łotowska) from the Medical University of Białystok[5], who unanimously stated that
"the material sent for evaluation (...) indicates cardiac muscle tissue, or at least, of all the living tissues of the body, it most closely resembles it." Prof. Sobaniec-Łotowska described the research results as follows: "We examined the fragment of material collected from the corporal histologically, (...) using an optical microscope, i.e. light microscope, and ultrasound, (...) using a transmission electron microscope (...), we observed the phenomenon of mutual penetration of the structure of the communicant with heart muscle fibers. The tissue that appeared on the Host was very closely and inextricably connected to it, which is important proof that there could be no human interference. (...) the cytoplasm of fragments of muscle fibers embedded in the substrate, which may correspond to the structure of the Host, was stained pink, focally quite intensely, when stained with Mayer's hematoxylin and eosin. However, cell nuclei, located mainly in the center (...) are dark blue. Well, the central location of the cell nuclei indicates that it is the muscle of the human heart. (...) we observed features of more pronounced fiber segmentation, i.e. cell damage at the insertions (i.e. structures characteristic of the heart muscle), and fragmentation - this is fiber damage outside the inserts; We also found images along the course of single fibers that could correspond to contraction nodes. Such changes occur only in non-necrotic fibers and reflect contractions of the heart muscle in the antemortem, i.e. agonal, period.