Mishnà su I Cronache 24:78

Rabbi Elazar of Bartotha said: give to Him of that which is His, for you and that which is yours is His; and thus it says with regards to David: “for everything comes from You, and from Your own hand have we given you” (I Chronicles 29:14). Rabbi Jacob said: if one is studying while walking on the road and interrupts his study and says, “how fine is this tree!” [or] “how fine is this newly ploughed field!” scripture accounts it to him as if he was mortally guilty.