[Rabbi Issachar said: What is the meaning of "and his banner over me is love" (Song of Songs 2:4)? Even when a person sits and occupies himself with the Torah, and skips [medaleg, from the root DLG] from one halakhah to another and from one verse to another, the Holy One, blessed be He, says: He is dear to Me, and "his banner [diglo, from the root DGL] over Me is love," and his skipping [dilugo, from the root DLG] over Me is love.
Rabbi Issachar on the Banner of Love and Skipping in Torah Study
Midrash Tanchuma Buber, Bamidbar 10:4
[ר' יששכר אמר מהו ודגלו עלי אהבה, אפי' אדם יושב ועוסק בתורה ומדלג מהלכה להלכה ומפסוק לפסוק, יאמר הקב"ה חביב עלי הוא ודגלו עלי אהבה, ודלוגו עלי אהבה.