R Tzadok in his sefer Pri tzedek, Vayechi, 4. ; ;We say every shabbos, in pesukai desimra "hodu Lashem....Ki leolam chasdo". Within that kepitel of tehilim we say "leosei niflaot...", and subsequently go-on to mention brias haolam and yetzias mitzrayim, and finally kriyat yam suf. The question be...