Prayer must follow immediately upon the blessing of redemption: "May the words of my mouth be acceptable" (Psalms 19:15), and what is written after it? "May the LORD answer you in the day of trouble" (Psalms 20:2). Slaughter must follow immediately upon the laying-on of hands: "and he shall lay his hand and slaughter" (Leviticus 1:4-5). The blessing must follow immediately upon the washing of the hands: "Lift up your hands in holiness" (Psalms 134:2). Rabbi Yose bar Bon said: Whoever joins the slaughter immediately to the laying-on of hands, the disqualification of refuse-thought does not touch that sacrifice. And whoever joins the blessing immediately to the washing of the hands, the Accuser does not lodge a charge against that meal. And whoever joins prayer immediately to the blessing of redemption, the Accuser does not lodge a charge against him that whole day.
Joining the Acts Keeps the Accuser Far From You
Yalkut Shimoni on Torah 439:2
תֵּכֶף לִגְאֻלָּה תְּפִלָּה (תהלים יט, טו) "יִהְיוּ לְרָצוֹן אִמְרֵי פִי" וְגוֹ' מַה כְּתִיב בַּתְרֵיהּ "יַעַנְךָ ה' בְּיוֹם צָרָה" תֵּכֶף לִסְמִיכָה שְׁחִיטָה, וְסָמַךְ וְשָׁחַט תֵּכֶף לִנְטִילַת יָדַיִם בְּרָכָה, (שם קלד, ב) "שְׂאוּ יְדֵיכֶם קֹדֶשׁ" וְגוֹ'. אָמַר רַבִּי יוֹסִי בַּר בּוֹן כָּל מִי שֶׁתּוֹכֵף לִסְמִיכָה שְׁחִיטָה אֵין הַפִּגּוּל נוֹגֵעַ בְּאוֹתוֹ קָרְבָּן, וְכָל מִי שֶׁתּוֹכֵף לִנְטִילַת יָדַיִם בְּרָכָה, אֵין הַשָּׂטָן מְקַטְרֵג בְּאוֹתָהּ סְעֻדָּה, וְכָל מִי שֶׁתּוֹכֵף לִגְאֻלָּה תְּפִלָּה אֵין הַשָּׂטָן מְקַטְרֵג בְּאוֹתוֹ הַיּוֹם.