Sotah 48A

ואנן קא יהבינן לכהנים.

and we give it to the priests. Ezra penalized the Levites for not ascending with him from Babylonia to Eretz Yisrael by taking away their right to the first tithe. Consequently, the owner of the produce can no longer recite the declaration of tithes, which includes the statement: “I have done according to all that You have commanded me” (Deuteronomy 26:14), as he did not give the tithe to the Levites.

ולודי אשאר מעשרות? אמר ריש לקיש: כל בית שאין מתודה על מעשר ראשון ⁠— שוב אין מתודה על שאר מעשרות. מאי טעמא? אמר אביי: הואיל ופתח בו הכתוב תחילה.

The Talmud asks: And let him at least declare that he donated the other tithes in the proper manner. Reish Lakish said: Any house that does not state the declaration about the first tithe can no longer state the declaration of the other types of tithes. The Talmud asks: What is the reason for this? Abaye said: Because the written verse began the declaration with the tithe given to the Levites: “And I also gave it to the Levite, and to the stranger, to the orphan, and to the widow, in accordance with all Your mitzvot that You commanded me” (Deuteronomy 26:13). If he cannot say the first part of the declaration, he cannot say the rest.

מכלל דאפרושי הוו מפרשי? והא תניא: אף הוא ביטל את הוידוי, וגזר על הדמאי. לפי ששלח בכל גבול ישראל וראה שאין מפרישין אלא תרומה גדולה בלבד, ומעשר ראשון ומעשר שני ⁠— מקצתן מעשרין ומקצתן אין מעשרין.

The Talmud poses a question: The fact that R' Yoḥanan canceled the declaration of tithes proves by inference that they would separate tithes in his days. But isn’t it taught (Tosefta 13:10): He, Yoḥanan the High Priest, also canceled the declaration of tithes and decreed with regard to doubtfully tithed produce [demai]? Why did he issue this decree? Because he sent messengers throughout the land, to all the borders of Eretz Yisrael to investigate, and saw that they would separate only teruma gedola, and as for first tithe and second tithe, some people would tithe and some people would not tithe.