Reference for Menachot 31:7

יתיב רבא וקאמר לה להא שמעתא איתיביה רב אחא בר רב הונא לרבא בד"א בקמיצה ובמתן כלי ובהילוך

but if he had already reached the service of burning, and he offered the handful in silence and then the frankincense with the expressed intention, or if he offered the handful with the expressed intention and then the frankincense in silence, R'Meir says, It is piggul and the penalty of kareth is incurred on account thereof. The Sages say, The penalty of kareth is not incurred unless he expressed an intention which makes piggul during the service of the whole of the mattir.

Jastrow